// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <ostream>

#include "gmock/gmock.h"
#include "src/reader/spirv/function.h"
#include "src/reader/spirv/parser_impl_test_helper.h"
#include "src/reader/spirv/spirv_tools_helpers_test.h"

namespace tint {
namespace reader {
namespace spirv {
namespace {

using ::testing::Eq;
using ::testing::HasSubstr;
using ::testing::Not;
using ::testing::StartsWith;

using SpvParserHandleTest = SpvParserTest;

std::string Preamble() {
  return R"(
    OpCapability Shader
    OpCapability Sampled1D
    OpCapability Image1D
    OpCapability StorageImageExtendedFormats
    OpCapability ImageQuery
    OpMemoryModel Logical Simple
  )";
}

std::string FragMain() {
  return R"(
    OpEntryPoint Fragment %main "main" ; assume no IO
    OpExecutionMode %main OriginUpperLeft
  )";
}

std::string MainBody() {
  return R"(
    %main = OpFunction %void None %voidfn
    %main_entry = OpLabel
    OpReturn
    OpFunctionEnd
  )";
}

std::string CommonBasicTypes() {
  return R"(
    %void = OpTypeVoid
    %voidfn = OpTypeFunction %void

    %float = OpTypeFloat 32
    %uint = OpTypeInt 32 0
    %int = OpTypeInt 32 1

    %int_0 = OpConstant %int 0
    %int_1 = OpConstant %int 1
    %int_2 = OpConstant %int 2
    %int_3 = OpConstant %int 3
    %int_4 = OpConstant %int 4
    %uint_0 = OpConstant %uint 0
    %uint_1 = OpConstant %uint 1
    %uint_2 = OpConstant %uint 2
    %uint_3 = OpConstant %uint 3
    %uint_4 = OpConstant %uint 4
    %uint_100 = OpConstant %uint 100

    %v2int = OpTypeVector %int 2
    %v3int = OpTypeVector %int 3
    %v4int = OpTypeVector %int 4
    %v2uint = OpTypeVector %uint 2
    %v3uint = OpTypeVector %uint 3
    %v4uint = OpTypeVector %uint 4
    %v2float = OpTypeVector %float 2
    %v3float = OpTypeVector %float 3
    %v4float = OpTypeVector %float 4

    %float_null = OpConstantNull %float
    %float_0 = OpConstant %float 0
    %float_1 = OpConstant %float 1
    %float_2 = OpConstant %float 2
    %float_3 = OpConstant %float 3
    %float_4 = OpConstant %float 4
    %float_7 = OpConstant %float 7
    %v2float_null = OpConstantNull %v2float
    %v3float_null = OpConstantNull %v3float
    %v4float_null = OpConstantNull %v4float

    %the_vi12 = OpConstantComposite %v2int %int_1 %int_2
    %the_vi123 = OpConstantComposite %v3int %int_1 %int_2 %int_3
    %the_vi1234 = OpConstantComposite %v4int %int_1 %int_2 %int_3 %int_4

    %the_vu12 = OpConstantComposite %v2uint %uint_1 %uint_2
    %the_vu123 = OpConstantComposite %v3uint %uint_1 %uint_2 %uint_3
    %the_vu1234 = OpConstantComposite %v4uint %uint_1 %uint_2 %uint_3 %uint_4

    %the_vf12 = OpConstantComposite %v2float %float_1 %float_2
    %the_vf21 = OpConstantComposite %v2float %float_2 %float_1
    %the_vf123 = OpConstantComposite %v3float %float_1 %float_2 %float_3
    %the_vf1234 = OpConstantComposite %v4float %float_1 %float_2 %float_3 %float_4


    %depth = OpConstant %float 0.2
  )";
}

std::string CommonImageTypes() {
  return R"(

; Define types for all sampler and texture types that can map to WGSL,
; modulo texel formats for storage textures. For now, we limit
; ourselves to 2-channel 32-bit texel formats.

; Because the SPIR-V reader also already generalizes so it can work with
; combined image-samplers, we also test that too.

    %sampler = OpTypeSampler

    ; sampled images
    %f_texture_1d          = OpTypeImage %float 1D   0 0 0 1 Unknown
    %f_texture_2d          = OpTypeImage %float 2D   0 0 0 1 Unknown
    %f_texture_2d_ms       = OpTypeImage %float 2D   0 0 1 1 Unknown
    %f_texture_2d_array    = OpTypeImage %float 2D   0 1 0 1 Unknown
    %f_texture_2d_ms_array = OpTypeImage %float 2D   0 1 1 1 Unknown ; not in WebGPU
    %f_texture_3d          = OpTypeImage %float 3D   0 0 0 1 Unknown
    %f_texture_cube        = OpTypeImage %float Cube 0 0 0 1 Unknown
    %f_texture_cube_array  = OpTypeImage %float Cube 0 1 0 1 Unknown

    ; storage images
    %f_storage_1d         = OpTypeImage %float 1D   0 0 0 2 Rg32f
    %f_storage_2d         = OpTypeImage %float 2D   0 0 0 2 Rg32f
    %f_storage_2d_array   = OpTypeImage %float 2D   0 1 0 2 Rg32f
    %f_storage_3d         = OpTypeImage %float 3D   0 0 0 2 Rg32f

    ; Now all the same, but for unsigned integer sampled type.

    %u_texture_1d          = OpTypeImage %uint  1D   0 0 0 1 Unknown
    %u_texture_2d          = OpTypeImage %uint  2D   0 0 0 1 Unknown
    %u_texture_2d_ms       = OpTypeImage %uint  2D   0 0 1 1 Unknown
    %u_texture_2d_array    = OpTypeImage %uint  2D   0 1 0 1 Unknown
    %u_texture_2d_ms_array = OpTypeImage %uint  2D   0 1 1 1 Unknown ; not in WebGPU
    %u_texture_3d          = OpTypeImage %uint  3D   0 0 0 1 Unknown
    %u_texture_cube        = OpTypeImage %uint  Cube 0 0 0 1 Unknown
    %u_texture_cube_array  = OpTypeImage %uint  Cube 0 1 0 1 Unknown

    %u_storage_1d         = OpTypeImage %uint  1D   0 0 0 2 Rg32ui
    %u_storage_2d         = OpTypeImage %uint  2D   0 0 0 2 Rg32ui
    %u_storage_2d_array   = OpTypeImage %uint  2D   0 1 0 2 Rg32ui
    %u_storage_3d         = OpTypeImage %uint  3D   0 0 0 2 Rg32ui

    ; Now all the same, but for signed integer sampled type.

    %i_texture_1d          = OpTypeImage %int  1D   0 0 0 1 Unknown
    %i_texture_2d          = OpTypeImage %int  2D   0 0 0 1 Unknown
    %i_texture_2d_ms       = OpTypeImage %int  2D   0 0 1 1 Unknown
    %i_texture_2d_array    = OpTypeImage %int  2D   0 1 0 1 Unknown
    %i_texture_2d_ms_array = OpTypeImage %int  2D   0 1 1 1 Unknown ; not in WebGPU
    %i_texture_3d          = OpTypeImage %int  3D   0 0 0 1 Unknown
    %i_texture_cube        = OpTypeImage %int  Cube 0 0 0 1 Unknown
    %i_texture_cube_array  = OpTypeImage %int  Cube 0 1 0 1 Unknown

    %i_storage_1d         = OpTypeImage %int  1D   0 0 0 2 Rg32i
    %i_storage_2d         = OpTypeImage %int  2D   0 0 0 2 Rg32i
    %i_storage_2d_array   = OpTypeImage %int  2D   0 1 0 2 Rg32i
    %i_storage_3d         = OpTypeImage %int  3D   0 0 0 2 Rg32i

    ;; Now pointers to each of the above, so we can declare variables for them.

    %ptr_sampler = OpTypePointer UniformConstant %sampler

    %ptr_f_texture_1d          = OpTypePointer UniformConstant %f_texture_1d
    %ptr_f_texture_2d          = OpTypePointer UniformConstant %f_texture_2d
    %ptr_f_texture_2d_ms       = OpTypePointer UniformConstant %f_texture_2d_ms
    %ptr_f_texture_2d_array    = OpTypePointer UniformConstant %f_texture_2d_array
    %ptr_f_texture_2d_ms_array = OpTypePointer UniformConstant %f_texture_2d_ms_array
    %ptr_f_texture_3d          = OpTypePointer UniformConstant %f_texture_3d
    %ptr_f_texture_cube        = OpTypePointer UniformConstant %f_texture_cube
    %ptr_f_texture_cube_array  = OpTypePointer UniformConstant %f_texture_cube_array

    ; storage images
    %ptr_f_storage_1d         = OpTypePointer UniformConstant %f_storage_1d
    %ptr_f_storage_2d         = OpTypePointer UniformConstant %f_storage_2d
    %ptr_f_storage_2d_array   = OpTypePointer UniformConstant %f_storage_2d_array
    %ptr_f_storage_3d         = OpTypePointer UniformConstant %f_storage_3d

    ; Now all the same, but for unsigned integer sampled type.

    %ptr_u_texture_1d          = OpTypePointer UniformConstant %u_texture_1d
    %ptr_u_texture_2d          = OpTypePointer UniformConstant %u_texture_2d
    %ptr_u_texture_2d_ms       = OpTypePointer UniformConstant %u_texture_2d_ms
    %ptr_u_texture_2d_array    = OpTypePointer UniformConstant %u_texture_2d_array
    %ptr_u_texture_2d_ms_array = OpTypePointer UniformConstant %u_texture_2d_ms_array
    %ptr_u_texture_3d          = OpTypePointer UniformConstant %u_texture_3d
    %ptr_u_texture_cube        = OpTypePointer UniformConstant %u_texture_cube
    %ptr_u_texture_cube_array  = OpTypePointer UniformConstant %u_texture_cube_array

    %ptr_u_storage_1d         = OpTypePointer UniformConstant %u_storage_1d
    %ptr_u_storage_2d         = OpTypePointer UniformConstant %u_storage_2d
    %ptr_u_storage_2d_array   = OpTypePointer UniformConstant %u_storage_2d_array
    %ptr_u_storage_3d         = OpTypePointer UniformConstant %u_storage_3d

    ; Now all the same, but for signed integer sampled type.

    %ptr_i_texture_1d          = OpTypePointer UniformConstant %i_texture_1d
    %ptr_i_texture_2d          = OpTypePointer UniformConstant %i_texture_2d
    %ptr_i_texture_2d_ms       = OpTypePointer UniformConstant %i_texture_2d_ms
    %ptr_i_texture_2d_array    = OpTypePointer UniformConstant %i_texture_2d_array
    %ptr_i_texture_2d_ms_array = OpTypePointer UniformConstant %i_texture_2d_ms_array
    %ptr_i_texture_3d          = OpTypePointer UniformConstant %i_texture_3d
    %ptr_i_texture_cube        = OpTypePointer UniformConstant %i_texture_cube
    %ptr_i_texture_cube_array  = OpTypePointer UniformConstant %i_texture_cube_array

    %ptr_i_storage_1d         = OpTypePointer UniformConstant %i_storage_1d
    %ptr_i_storage_2d         = OpTypePointer UniformConstant %i_storage_2d
    %ptr_i_storage_2d_array   = OpTypePointer UniformConstant %i_storage_2d_array
    %ptr_i_storage_3d         = OpTypePointer UniformConstant %i_storage_3d

  )";
}

std::string CommonTypes() {
  return CommonBasicTypes() + CommonImageTypes();
}

std::string Bindings(std::vector<uint32_t> ids) {
  std::ostringstream os;
  int binding = 0;
  for (auto id : ids) {
    os << "  OpDecorate %" << id << " DescriptorSet 0\n"
       << "  OpDecorate %" << id << " Binding " << binding++ << "\n";
  }
  return os.str();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_WellFormedButNotAHandle) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %10 = OpConstantNull %ptr_sampler
     %20 = OpConstantNull %ptr_f_texture_1d
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule()) << assembly;
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(10, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(20, true);

  EXPECT_EQ(sampler, nullptr);
  EXPECT_EQ(image, nullptr);
  EXPECT_TRUE(p->error().empty());

  p->DeliberatelyInvalidSpirv();  // WGSL does not have null pointers.
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_Direct) {
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(
     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_1d UniformConstant
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(10, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(20, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_AccessChain) {
  // Show that we would generalize to arrays of handles, even though that
  // is not supported in WGSL MVP.
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %10 = OpVariable %ptr_sampler_array UniformConstant
     %20 = OpVariable %ptr_image_array UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpAccessChain %ptr_sampler %10 %uint_1
     %120 = OpAccessChain %ptr_f_texture_1d %20 %uint_2

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // WGSL does not support arrays of textures and samplers.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_InBoundsAccessChain) {
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %10 = OpVariable %ptr_sampler_array UniformConstant
     %20 = OpVariable %ptr_image_array UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpInBoundsAccessChain %ptr_sampler %10 %uint_1
     %120 = OpInBoundsAccessChain %ptr_f_texture_1d %20 %uint_2

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // WGSL does not support arrays of textures and samplers.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_PtrAccessChain) {
  // Show that we would generalize to arrays of handles, even though that
  // is not supported in WGSL MVP.
  // Use VariablePointers for the OpInBoundsPtrAccessChain.
  const auto assembly = "OpCapability VariablePointers " + Preamble() +
                        FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %10 = OpVariable %ptr_sampler_array UniformConstant
     %20 = OpVariable %ptr_image_array UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpPtrAccessChain %ptr_sampler %10 %uint_1 %uint_1
     %120 = OpPtrAccessChain %ptr_f_texture_1d %20 %uint_1 %uint_2

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // Variable pointers is not allowed for WGSL. So don't dump it.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_InBoundsPtrAccessChain) {
  // Use VariablePointers for the OpInBoundsPtrAccessChain.
  const auto assembly = "OpCapability VariablePointers " + Preamble() +
                        FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %10 = OpVariable %ptr_sampler_array UniformConstant
     %20 = OpVariable %ptr_image_array UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpInBoundsPtrAccessChain %ptr_sampler %10 %uint_1 %uint_1
     %120 = OpInBoundsPtrAccessChain %ptr_f_texture_1d %20 %uint_1 %uint_2

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // Variable pointers is not allowed for WGSL. So don't dump it.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_CopyObject) {
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_1d UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpCopyObject %ptr_sampler %10
     %120 = OpCopyObject %ptr_f_texture_1d %20

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);
}

TEST_F(SpvParserHandleTest, GetMemoryObjectDeclarationForHandle_Variable_Load) {
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_1d UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %110 = OpLoad %sampler %10
     %120 = OpLoad %f_texture_1d %20

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_SampledImage) {
  // Trace through the sampled image instruction, but in two different
  // directions.
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(
     %sampled_image_type = OpTypeSampledImage %f_texture_1d

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_1d UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %s = OpLoad %sampler %10
     %im = OpLoad %f_texture_1d %20
     %100 = OpSampledImage %sampled_image_type %im %s

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(100, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(100, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_Variable_Image) {
  const auto assembly =
      Preamble() + FragMain() + Bindings({10, 20}) + CommonTypes() + R"(
     %sampled_image_type = OpTypeSampledImage %f_texture_1d

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_1d UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %s = OpLoad %sampler %10
     %im = OpLoad %f_texture_1d %20
     %100 = OpSampledImage %sampled_image_type %im %s
     %200 = OpImage %f_texture_1d %100

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());

  const auto* image = p->GetMemoryObjectDeclarationForHandle(200, true);
  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_Direct) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %fty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_1d

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler
     %20 = OpFunctionParameter %ptr_f_texture_1d
     %entry = OpLabel
     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(10, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(20, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  p->SkipDumpingPending("crbug.com/tint/1039");
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_AccessChain) {
  // Show that we would generalize to arrays of handles, even though that
  // is not supported in WGSL MVP.
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %fty = OpTypeFunction %void %ptr_sampler_array %ptr_image_array

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler_array
     %20 = OpFunctionParameter %ptr_image_array
     %entry = OpLabel

     %110 = OpAccessChain %ptr_sampler %10 %uint_1
     %120 = OpAccessChain %ptr_f_texture_1d %20 %uint_2

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // WGSL does not support arrays of textures or samplers
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_InBoundsAccessChain) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %fty = OpTypeFunction %void %ptr_sampler_array %ptr_image_array

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler_array
     %20 = OpFunctionParameter %ptr_image_array
     %entry = OpLabel

     %110 = OpInBoundsAccessChain %ptr_sampler %10 %uint_1
     %120 = OpInBoundsAccessChain %ptr_f_texture_1d %20 %uint_2

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // WGSL does not support arrays of textures or samplers
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_PtrAccessChain) {
  // Show that we would generalize to arrays of handles, even though that
  // is not supported in WGSL MVP.
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %fty = OpTypeFunction %void %ptr_sampler_array %ptr_image_array

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler_array
     %20 = OpFunctionParameter %ptr_image_array
     %entry = OpLabel

     %110 = OpPtrAccessChain %ptr_sampler %10 %uint_1 %uint_1
     %120 = OpPtrAccessChain %ptr_f_texture_1d %20 %uint_1 %uint_2

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // Variable pointers is not allowed for WGSL. So don't dump it.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_InBoundsPtrAccessChain) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampler_array = OpTypeArray %sampler %uint_100
     %image_array = OpTypeArray %f_texture_1d %uint_100

     %ptr_sampler_array = OpTypePointer UniformConstant %sampler_array
     %ptr_image_array = OpTypePointer UniformConstant %image_array

     %fty = OpTypeFunction %void %ptr_sampler_array %ptr_image_array

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler_array
     %20 = OpFunctionParameter %ptr_image_array
     %entry = OpLabel

     %110 = OpInBoundsPtrAccessChain %ptr_sampler %10 %uint_1 %uint_1
     %120 = OpInBoundsPtrAccessChain %ptr_f_texture_1d %20 %uint_1 %uint_2

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  // Variable pointers is not allowed for WGSL. So don't dump it.
  p->DeliberatelyInvalidSpirv();
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_CopyObject) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %fty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_1d

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler
     %20 = OpFunctionParameter %ptr_f_texture_1d
     %entry = OpLabel

     %110 = OpCopyObject %ptr_sampler %10
     %120 = OpCopyObject %ptr_f_texture_1d %20

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  p->SkipDumpingPending("crbug.com/tint/1039");
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_Load) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %fty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_1d

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler
     %20 = OpFunctionParameter %ptr_f_texture_1d
     %entry = OpLabel

     %110 = OpLoad %sampler %10
     %120 = OpLoad %f_texture_1d %20

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(110, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(120, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  p->SkipDumpingPending("crbug.com/tint/1039");
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_SampledImage) {
  // Trace through the sampled image instruction, but in two different
  // directions.
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampled_image_type = OpTypeSampledImage %f_texture_1d

     %fty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_1d

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler
     %20 = OpFunctionParameter %ptr_f_texture_1d
     %entry = OpLabel

     %s = OpLoad %sampler %10
     %im = OpLoad %f_texture_1d %20
     %100 = OpSampledImage %sampled_image_type %im %s

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto* sampler = p->GetMemoryObjectDeclarationForHandle(100, false);
  const auto* image = p->GetMemoryObjectDeclarationForHandle(100, true);

  ASSERT_TRUE(sampler != nullptr);
  EXPECT_EQ(sampler->result_id(), 10u);

  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  p->SkipDumpingPending("crbug.com/tint/1039");
}

TEST_F(SpvParserHandleTest,
       GetMemoryObjectDeclarationForHandle_FuncParam_Image) {
  const auto assembly = Preamble() + FragMain() + CommonTypes() + R"(
     %sampled_image_type = OpTypeSampledImage %f_texture_1d

     %fty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_1d

     %func = OpFunction %void None %fty
     %10 = OpFunctionParameter %ptr_sampler
     %20 = OpFunctionParameter %ptr_f_texture_1d
     %entry = OpLabel

     %s = OpLoad %sampler %10
     %im = OpLoad %f_texture_1d %20
     %100 = OpSampledImage %sampled_image_type %im %s
     %200 = OpImage %f_texture_1d %100

     OpReturn
     OpFunctionEnd
  )" + MainBody();
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->error().empty());

  const auto* image = p->GetMemoryObjectDeclarationForHandle(200, true);
  ASSERT_TRUE(image != nullptr);
  EXPECT_EQ(image->result_id(), 20u);

  p->SkipDumpingPending("crbug.com/tint/1039");
}

// Test RegisterHandleUsage, sampled image cases

struct UsageImageAccessCase {
  std::string inst;
  std::string expected_sampler_usage;
  std::string expected_image_usage;
};
inline std::ostream& operator<<(std::ostream& out,
                                const UsageImageAccessCase& c) {
  out << "UsageImageAccessCase(" << c.inst << ", " << c.expected_sampler_usage
      << ", " << c.expected_image_usage << ")";
  return out;
}

using SpvParserHandleTest_RegisterHandleUsage_SampledImage =
    SpvParserTestBase<::testing::TestWithParam<UsageImageAccessCase>>;

TEST_P(SpvParserHandleTest_RegisterHandleUsage_SampledImage, Variable) {
  const std::string inst = GetParam().inst;
  const auto assembly = Preamble() + FragMain() + Bindings({10, 20}) +
                        CommonTypes() + R"(
     %si_ty = OpTypeSampledImage %f_texture_2d
     %coords = OpConstantNull %v2float
     %coords3d = OpConstantNull %v3float ; needed for Proj variants

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_2d UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %sam = OpLoad %sampler %10
     %im = OpLoad %f_texture_2d %20
     %sampled_image = OpSampledImage %si_ty %im %sam
)" + GetParam().inst + R"(

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->RegisterHandleUsage());
  EXPECT_TRUE(p->error().empty());
  Usage su = p->GetHandleUsage(10);
  Usage iu = p->GetHandleUsage(20);

  EXPECT_THAT(su.to_str(), Eq(GetParam().expected_sampler_usage));
  EXPECT_THAT(iu.to_str(), Eq(GetParam().expected_image_usage));

  if (inst.find("ImageQueryLod") != std::string::npos) {
    // WGSL does not support querying image level of detail.
    // So don't emit them as part of a "passing" corpus.
    p->DeliberatelyInvalidSpirv();
  }
  if (inst.find("ImageSampleDrefExplicitLod") != std::string::npos) {
    p->SkipDumpingPending("crbug.com/tint/425");  // gpuweb issue #1319
  }
}

TEST_P(SpvParserHandleTest_RegisterHandleUsage_SampledImage, FunctionParam) {
  const std::string inst = GetParam().inst;
  const auto assembly = Preamble() + FragMain() + Bindings({10, 20}) +
                        CommonTypes() + R"(
     %f_ty = OpTypeFunction %void %ptr_sampler %ptr_f_texture_2d
     %si_ty = OpTypeSampledImage %f_texture_2d
     %coords = OpConstantNull %v2float
     %coords3d = OpConstantNull %v3float ; needed for Proj variants
     %component = OpConstant %uint 1

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_f_texture_2d UniformConstant

     %func = OpFunction %void None %f_ty
     %110 = OpFunctionParameter %ptr_sampler
     %120 = OpFunctionParameter %ptr_f_texture_2d
     %func_entry = OpLabel
     %sam = OpLoad %sampler %110
     %im = OpLoad %f_texture_2d %120
     %sampled_image = OpSampledImage %si_ty %im %sam

)" + inst + R"(

     OpReturn
     OpFunctionEnd

     %main = OpFunction %void None %voidfn
     %entry = OpLabel
     %foo = OpFunctionCall %void %func %10 %20
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule()) << p->error() << assembly << std::endl;
  EXPECT_TRUE(p->RegisterHandleUsage()) << p->error() << assembly << std::endl;
  EXPECT_TRUE(p->error().empty()) << p->error() << assembly << std::endl;
  Usage su = p->GetHandleUsage(10);
  Usage iu = p->GetHandleUsage(20);

  EXPECT_THAT(su.to_str(), Eq(GetParam().expected_sampler_usage));
  EXPECT_THAT(iu.to_str(), Eq(GetParam().expected_image_usage));

  if (inst.find("ImageQueryLod") != std::string::npos) {
    // WGSL does not support querying image level of detail.
    // So don't emit them as part of a "passing" corpus.
    p->DeliberatelyInvalidSpirv();
  }
  p->SkipDumpingPending("crbug.com/tint/785");
}

INSTANTIATE_TEST_SUITE_P(
    Samples,
    SpvParserHandleTest_RegisterHandleUsage_SampledImage,
    ::testing::Values(

        // OpImageGather
        UsageImageAccessCase{"%result = OpImageGather "
                             "%v4float %sampled_image %coords %uint_1",
                             "Usage(Sampler( ))",
                             "Usage(Texture( is_sampled ))"},
        // OpImageDrefGather
        UsageImageAccessCase{"%result = OpImageDrefGather "
                             "%v4float %sampled_image %coords %depth",
                             "Usage(Sampler( comparison ))",
                             "Usage(Texture( is_sampled depth ))"},

        // Sample the texture.

        // OpImageSampleImplicitLod
        UsageImageAccessCase{"%result = OpImageSampleImplicitLod "
                             "%v4float %sampled_image %coords",
                             "Usage(Sampler( ))",
                             "Usage(Texture( is_sampled ))"},
        // OpImageSampleExplicitLod
        UsageImageAccessCase{"%result = OpImageSampleExplicitLod "
                             "%v4float %sampled_image %coords Lod %float_null",
                             "Usage(Sampler( ))",
                             "Usage(Texture( is_sampled ))"},
        // OpImageSampleDrefImplicitLod
        UsageImageAccessCase{"%result = OpImageSampleDrefImplicitLod "
                             "%float %sampled_image %coords %depth",
                             "Usage(Sampler( comparison ))",
                             "Usage(Texture( is_sampled depth ))"},
        // OpImageSampleDrefExplicitLod
        UsageImageAccessCase{
            "%result = OpImageSampleDrefExplicitLod "
            "%float %sampled_image %coords %depth Lod %float_null",
            "Usage(Sampler( comparison ))",
            "Usage(Texture( is_sampled depth ))"},

        // Sample the texture, with *Proj* variants, even though WGSL doesn't
        // support them.

        // OpImageSampleProjImplicitLod
        UsageImageAccessCase{"%result = OpImageSampleProjImplicitLod "
                             "%v4float %sampled_image %coords3d",
                             "Usage(Sampler( ))",
                             "Usage(Texture( is_sampled ))"},
        // OpImageSampleProjExplicitLod
        UsageImageAccessCase{
            "%result = OpImageSampleProjExplicitLod "
            "%v4float %sampled_image %coords3d Lod %float_null",
            "Usage(Sampler( ))", "Usage(Texture( is_sampled ))"},
        // OpImageSampleProjDrefImplicitLod
        UsageImageAccessCase{"%result = OpImageSampleProjDrefImplicitLod "
                             "%float %sampled_image %coords3d %depth",
                             "Usage(Sampler( comparison ))",
                             "Usage(Texture( is_sampled depth ))"},
        // OpImageSampleProjDrefExplicitLod
        UsageImageAccessCase{
            "%result = OpImageSampleProjDrefExplicitLod "
            "%float %sampled_image %coords3d %depth Lod %float_null",
            "Usage(Sampler( comparison ))",
            "Usage(Texture( is_sampled depth ))"},

        // OpImageQueryLod
        UsageImageAccessCase{
            "%result = OpImageQueryLod %v2float %sampled_image %coords",
            "Usage(Sampler( ))", "Usage(Texture( is_sampled ))"}));

// Test RegisterHandleUsage, raw image cases.
// For these we test the use of an image value directly, and not combined
// with the sampler. The image still could be of sampled image type.

struct UsageRawImageCase {
  std::string type;  // Example: f_storage_1d or f_texture_1d
  std::string inst;
  std::string expected_image_usage;
};
inline std::ostream& operator<<(std::ostream& out, const UsageRawImageCase& c) {
  out << "UsageRawImageCase(" << c.type << ", " << c.inst << ", "
      << c.expected_image_usage << ")";
  return out;
}

using SpvParserHandleTest_RegisterHandleUsage_RawImage =
    SpvParserTestBase<::testing::TestWithParam<UsageRawImageCase>>;

TEST_P(SpvParserHandleTest_RegisterHandleUsage_RawImage, Variable) {
  const bool is_storage = GetParam().type.find("storage") != std::string::npos;
  const bool is_write = GetParam().inst.find("ImageWrite") != std::string::npos;
  const auto assembly = Preamble() + FragMain() + Bindings({20}) +
                        (is_storage ? std::string("OpDecorate %20 ") +
                                          std::string(is_write ? "NonReadable"
                                                               : "NonWritable")
                                    : std::string("")) +
                        " " + CommonTypes() + R"(
     %20 = OpVariable %ptr_)" +
                        GetParam().type + R"( UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %im = OpLoad %)" + GetParam().type +
                        R"( %20
)" + GetParam().inst + R"(

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->RegisterHandleUsage());
  EXPECT_TRUE(p->error().empty());

  Usage iu = p->GetHandleUsage(20);
  EXPECT_THAT(iu.to_str(), Eq(GetParam().expected_image_usage));

  Usage su = p->GetHandleUsage(20);
}

TEST_P(SpvParserHandleTest_RegisterHandleUsage_RawImage, FunctionParam) {
  const bool is_storage = GetParam().type.find("storage") != std::string::npos;
  const bool is_write = GetParam().inst.find("ImageWrite") != std::string::npos;
  const auto assembly = Preamble() + FragMain() + Bindings({20}) +
                        (is_storage ? std::string("OpDecorate %20 ") +
                                          std::string(is_write ? "NonReadable"
                                                               : "NonWritable")
                                    : std::string("")) +
                        " " + CommonTypes() + R"(
     %f_ty = OpTypeFunction %void %ptr_)" +
                        GetParam().type + R"(

     %20 = OpVariable %ptr_)" +
                        GetParam().type + R"( UniformConstant

     %func = OpFunction %void None %f_ty
     %i_param = OpFunctionParameter %ptr_)" +
                        GetParam().type + R"(
     %func_entry = OpLabel
     %im = OpLoad %)" + GetParam().type +
                        R"( %i_param

)" + GetParam().inst + R"(

     OpReturn
     OpFunctionEnd

     %main = OpFunction %void None %voidfn
     %entry = OpLabel
     %foo = OpFunctionCall %void %func %20
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildInternalModule());
  EXPECT_TRUE(p->RegisterHandleUsage());
  EXPECT_TRUE(p->error().empty());
  Usage iu = p->GetHandleUsage(20);

  EXPECT_THAT(iu.to_str(), Eq(GetParam().expected_image_usage));

  // Textures and samplers not yet supported as function parameters.
  p->SkipDumpingPending("crbug.com/tint/785");
}

INSTANTIATE_TEST_SUITE_P(
    Samples,
    SpvParserHandleTest_RegisterHandleUsage_RawImage,
    ::testing::Values(

        // OpImageRead
        UsageRawImageCase{"f_storage_1d",
                          "%result = OpImageRead %v4float %im %uint_1",
                          "Usage(Texture( read ))"},

        // OpImageWrite
        UsageRawImageCase{"f_storage_1d",
                          "OpImageWrite %im %uint_1 %v4float_null",
                          "Usage(Texture( write ))"},

        // OpImageFetch
        UsageRawImageCase{"f_texture_1d",
                          "%result = OpImageFetch "
                          "%v4float %im %uint_0",
                          "Usage(Texture( is_sampled ))"},

        // Image queries

        // OpImageQuerySizeLod
        UsageRawImageCase{"f_texture_2d",
                          "%result = OpImageQuerySizeLod "
                          "%v2uint %im %uint_1",
                          "Usage(Texture( is_sampled ))"},

        // OpImageQuerySize
        // Could be MS=1 or storage image. So it's non-committal.
        UsageRawImageCase{"f_storage_2d",
                          "%result = OpImageQuerySize "
                          "%v2uint %im",
                          "Usage()"},

        // OpImageQueryLevels
        UsageRawImageCase{"f_texture_2d",
                          "%result = OpImageQueryLevels "
                          "%uint %im",
                          "Usage(Texture( ))"},

        // OpImageQuerySamples
        UsageRawImageCase{"f_texture_2d_ms",
                          "%result = OpImageQuerySamples "
                          "%uint %im",
                          "Usage(Texture( is_sampled ms ))"}));

// Test emission of handle variables.

// Test emission of variables where we don't have enough clues from their
// use in image access instructions in executable code.  For these we have
// to infer usage from the SPIR-V sampler or image type.
struct DeclUnderspecifiedHandleCase {
  std::string decorations;  // SPIR-V decorations
  std::string inst;         // SPIR-V variable declarations
  std::string var_decl;     // WGSL variable declaration
};
inline std::ostream& operator<<(std::ostream& out,
                                const DeclUnderspecifiedHandleCase& c) {
  out << "DeclUnderspecifiedHandleCase(" << c.inst << "\n" << c.var_decl << ")";
  return out;
}

using SpvParserHandleTest_DeclUnderspecifiedHandle =
    SpvParserTestBase<::testing::TestWithParam<DeclUnderspecifiedHandleCase>>;

TEST_P(SpvParserHandleTest_DeclUnderspecifiedHandle, Variable) {
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %main "main"
     OpExecutionMode %main OriginUpperLeft
     OpDecorate %10 DescriptorSet 0
     OpDecorate %10 Binding 0
)" + GetParam().decorations +
                        CommonTypes() + GetParam().inst +
                        R"(

     %main = OpFunction %void None %voidfn
     %entry = OpLabel
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << p->error() << assembly;
  EXPECT_TRUE(p->error().empty()) << p->error();
  const auto program = test::ToString(p->program());
  EXPECT_THAT(program, HasSubstr(GetParam().var_decl)) << program;
}

INSTANTIATE_TEST_SUITE_P(
    Samplers,
    SpvParserHandleTest_DeclUnderspecifiedHandle,
    ::testing::Values(

        DeclUnderspecifiedHandleCase{
            "", R"(
         %ptr = OpTypePointer UniformConstant %sampler
         %10 = OpVariable %ptr UniformConstant
)",
            R"(@group(0) @binding(0) var x_10 : sampler;)"}));

INSTANTIATE_TEST_SUITE_P(
    Images,
    SpvParserHandleTest_DeclUnderspecifiedHandle,
    ::testing::Values(

        DeclUnderspecifiedHandleCase{
            "", R"(
         %10 = OpVariable %ptr_f_texture_1d UniformConstant
)",
            R"(@group(0) @binding(0) var x_10 : texture_1d<f32>;)"},
        DeclUnderspecifiedHandleCase{
            R"(
         OpDecorate %10 NonWritable
)",
            R"(
         %10 = OpVariable %ptr_f_storage_1d UniformConstant
)",
            R"(@group(0) @binding(0) var x_10 : texture_1d<f32>;)"},
        DeclUnderspecifiedHandleCase{
            R"(
         OpDecorate %10 NonReadable
)",
            R"(
         %10 = OpVariable %ptr_f_storage_1d UniformConstant
)",
            R"(@group(0) @binding(0) var x_10 : texture_storage_1d<rg32float, write>;)"}));

// Test handle declaration or error, when there is an image access.

struct ImageDeclCase {
  // SPIR-V image type, excluding result ID and opcode
  std::string spirv_image_type_details;
  std::string spirv_image_access;  // Optional instruction to provoke use
  std::string expected_error;
  std::string expected_decl;
};

inline std::ostream& operator<<(std::ostream& out, const ImageDeclCase& c) {
  out << "ImageDeclCase(" << c.spirv_image_type_details << "\n"
      << "access: " << c.spirv_image_access << "\n"
      << "error: " << c.expected_error << "\n"
      << "decl:" << c.expected_decl << "\n)";
  return out;
}

using SpvParserHandleTest_ImageDeclTest =
    SpvParserTestBase<::testing::TestWithParam<ImageDeclCase>>;

TEST_P(SpvParserHandleTest_ImageDeclTest, DeclareAndUseHandle) {
  // Only declare the sampled image type, and the associated variable
  // if the requested image type is a sampled image type and not multisampled.
  const bool is_sampled_image_type = GetParam().spirv_image_type_details.find(
                                         "0 1 Unknown") != std::string::npos;
  const auto assembly =
      Preamble() + R"(
     OpEntryPoint Fragment %100 "main"
     OpExecutionMode %100 OriginUpperLeft
     OpName %float_var "float_var"
     OpName %ptr_float "ptr_float"
     OpName %i1 "i1"
     OpName %vi12 "vi12"
     OpName %vi123 "vi123"
     OpName %vi1234 "vi1234"
     OpName %u1 "u1"
     OpName %vu12 "vu12"
     OpName %vu123 "vu123"
     OpName %vu1234 "vu1234"
     OpName %f1 "f1"
     OpName %vf12 "vf12"
     OpName %vf123 "vf123"
     OpName %vf1234 "vf1234"
     OpDecorate %10 DescriptorSet 0
     OpDecorate %10 Binding 0
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
     OpDecorate %30 DescriptorSet 0
     OpDecorate %30 Binding 1
)" + CommonBasicTypes() +
      R"(
     %sampler = OpTypeSampler
     %ptr_sampler = OpTypePointer UniformConstant %sampler
     %im_ty = OpTypeImage )" +
      GetParam().spirv_image_type_details + R"(
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty
)" + (is_sampled_image_type ? " %si_ty = OpTypeSampledImage %im_ty " : "") +
      R"(

     %ptr_float = OpTypePointer Function %float

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_im_ty UniformConstant
     %30 = OpVariable %ptr_sampler UniformConstant ; comparison sampler, when needed

     %100 = OpFunction %void None %voidfn
     %entry = OpLabel

     %float_var = OpVariable %ptr_float Function

     %i1 = OpCopyObject %int %int_1
     %vi12 = OpCopyObject %v2int %the_vi12
     %vi123 = OpCopyObject %v3int %the_vi123
     %vi1234 = OpCopyObject %v4int %the_vi1234

     %u1 = OpCopyObject %uint %uint_1
     %vu12 = OpCopyObject %v2uint %the_vu12
     %vu123 = OpCopyObject %v3uint %the_vu123
     %vu1234 = OpCopyObject %v4uint %the_vu1234

     %f1 = OpCopyObject %float %float_1
     %vf12 = OpCopyObject %v2float %the_vf12
     %vf123 = OpCopyObject %v3float %the_vf123
     %vf1234 = OpCopyObject %v4float %the_vf1234

     %sam = OpLoad %sampler %10
     %im = OpLoad %im_ty %20

)" +
      (is_sampled_image_type
           ? " %sampled_image = OpSampledImage %si_ty %im %sam "
           : "") +
      GetParam().spirv_image_access +
      R"(
     ; Use an anchor for the cases when the image access doesn't have a result ID.
     %1000 = OpCopyObject %uint %uint_0

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  const bool succeeded = p->BuildAndParseInternalModule();
  if (succeeded) {
    EXPECT_TRUE(GetParam().expected_error.empty());
    const auto got = test::ToString(p->program());
    EXPECT_THAT(got, HasSubstr(GetParam().expected_decl));
  } else {
    EXPECT_FALSE(GetParam().expected_error.empty());
    EXPECT_THAT(p->error(), HasSubstr(GetParam().expected_error));
  }
}

INSTANTIATE_TEST_SUITE_P(
    Multisampled_Only2DNonArrayedIsValid,
    SpvParserHandleTest_ImageDeclTest,
    ::testing::ValuesIn(std::vector<ImageDeclCase>{
        {"%float 1D 0 0 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "WGSL multisampled textures must be 2d and non-arrayed: ", ""},
        {"%float 1D 0 1 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "WGSL arrayed textures must be 2d_array or cube_array: ", ""},
        {"%float 2D 0 0 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "", "@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;"},
        {"%float 2D 0 1 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "WGSL multisampled textures must be 2d and non-arrayed: ", ""},
        {"%float 3D 0 0 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "WGSL multisampled textures must be 2d and non-arrayed: ", ""},
        {"%float 3D 0 1 1 1 Unknown", "%result = OpImageQuerySamples %uint %im",
         "WGSL arrayed textures must be 2d_array or cube_array: ", ""},
        {"%float Cube 0 0 1 1 Unknown",
         "%result = OpImageQuerySamples %uint %im",
         "WGSL multisampled textures must be 2d and non-arrayed: ", ""},
        {"%float Cube 0 1 1 1 Unknown",
         "%result = OpImageQuerySamples %uint %im",
         "WGSL multisampled textures must be 2d and non-arrayed: ", ""}}));

// Test emission of variables when we have image accesses in executable code.

struct ImageAccessCase {
  // SPIR-V image type, excluding result ID and opcode
  std::string spirv_image_type_details;
  std::string spirv_image_access;  // The provoking image access instruction.
  std::string var_decl;            // WGSL variable declaration
  std::string texture_builtin;     // WGSL texture usage.
};
inline std::ostream& operator<<(std::ostream& out, const ImageAccessCase& c) {
  out << "ImageCase(" << c.spirv_image_type_details << "\n"
      << c.spirv_image_access << "\n"
      << c.var_decl << "\n"
      << c.texture_builtin << ")";
  return out;
}

using SpvParserHandleTest_SampledImageAccessTest =
    SpvParserTestBase<::testing::TestWithParam<ImageAccessCase>>;

TEST_P(SpvParserHandleTest_SampledImageAccessTest, Variable) {
  // Only declare the sampled image type, and the associated variable
  // if the requested image type is a sampled image type, and not a
  // multisampled texture
  const bool is_sampled_image_type = GetParam().spirv_image_type_details.find(
                                         "0 1 Unknown") != std::string::npos;
  const auto assembly =
      Preamble() + R"(
     OpEntryPoint Fragment %main "main"
     OpExecutionMode %main OriginUpperLeft
     OpName %f1 "f1"
     OpName %vf12 "vf12"
     OpName %vf21 "vf21"
     OpName %vf123 "vf123"
     OpName %vf1234 "vf1234"
     OpName %u1 "u1"
     OpName %vu12 "vu12"
     OpName %vu123 "vu123"
     OpName %vu1234 "vu1234"
     OpName %i1 "i1"
     OpName %vi12 "vi12"
     OpName %vi123 "vi123"
     OpName %vi1234 "vi1234"
     OpName %coords1 "coords1"
     OpName %coords12 "coords12"
     OpName %coords123 "coords123"
     OpName %coords1234 "coords1234"
     OpName %offsets2d "offsets2d"
     OpName %u_offsets2d "u_offsets2d"
     OpDecorate %10 DescriptorSet 0
     OpDecorate %10 Binding 0
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
     OpDecorate %30 DescriptorSet 0
     OpDecorate %30 Binding 1
)" + CommonBasicTypes() +
      R"(
     %sampler = OpTypeSampler
     %ptr_sampler = OpTypePointer UniformConstant %sampler
     %im_ty = OpTypeImage )" +
      GetParam().spirv_image_type_details + R"(
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty
)" + (is_sampled_image_type ? " %si_ty = OpTypeSampledImage %im_ty " : "") +
      R"(

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_im_ty UniformConstant
     %30 = OpVariable %ptr_sampler UniformConstant ; comparison sampler, when needed

     ; ConstOffset operands must be constants
     %offsets2d = OpConstantComposite %v2int %int_3 %int_4
     %u_offsets2d = OpConstantComposite %v2uint %uint_3 %uint_4

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %f1 = OpCopyObject %float %float_1
     %vf12 = OpCopyObject %v2float %the_vf12
     %vf21 = OpCopyObject %v2float %the_vf21
     %vf123 = OpCopyObject %v3float %the_vf123
     %vf1234 = OpCopyObject %v4float %the_vf1234

     %i1 = OpCopyObject %int %int_1
     %vi12 = OpCopyObject %v2int %the_vi12
     %vi123 = OpCopyObject %v3int %the_vi123
     %vi1234 = OpCopyObject %v4int %the_vi1234

     %u1 = OpCopyObject %uint %uint_1
     %vu12 = OpCopyObject %v2uint %the_vu12
     %vu123 = OpCopyObject %v3uint %the_vu123
     %vu1234 = OpCopyObject %v4uint %the_vu1234

     %coords1 = OpCopyObject %float %float_1
     %coords12 = OpCopyObject %v2float %vf12
     %coords123 = OpCopyObject %v3float %vf123
     %coords1234 = OpCopyObject %v4float %vf1234

     %sam = OpLoad %sampler %10
     %im = OpLoad %im_ty %20
)" +
      (is_sampled_image_type
           ? " %sampled_image = OpSampledImage %si_ty %im %sam\n"
           : "") +
      GetParam().spirv_image_access +
      R"(

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << p->error() << assembly;
  EXPECT_TRUE(p->error().empty()) << p->error();
  const auto program = test::ToString(p->program());
  EXPECT_THAT(program, HasSubstr(GetParam().var_decl))
      << "DECLARATIONS ARE BAD " << program;
  EXPECT_THAT(program, HasSubstr(GetParam().texture_builtin))
      << "TEXTURE BUILTIN IS BAD " << program << assembly;

  const bool is_query_size =
      GetParam().spirv_image_access.find("ImageQuerySize") != std::string::npos;
  const bool is_1d =
      GetParam().spirv_image_type_details.find("1D") != std::string::npos;
  if (is_query_size && is_1d) {
    p->SkipDumpingPending("crbug.com/tint/788");
  }
}

// TODO(dneto): Test variable declaration and texture builtins provoked by
// use of an image access instruction inside helper function.
TEST_P(SpvParserHandleTest_RegisterHandleUsage_SampledImage,
       DISABLED_FunctionParam) {}

INSTANTIATE_TEST_SUITE_P(
    ImageGather,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // OpImageGather 2D
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords12 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
                        "textureGather(1, x_20, x_10, coords12)"},
        // OpImageGather 2D ConstOffset signed
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageGather "
            "%v4float %sampled_image %coords12 %int_1 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            "textureGather(1, x_20, x_10, coords12, vec2<i32>(3, 4))"},
        // OpImageGather 2D ConstOffset unsigned
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords12 %int_1 ConstOffset "
                        "%u_offsets2d",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
                        "textureGather(1, x_20, x_10, coords12, "
                        "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageGather 2D Array
        ImageAccessCase{"%float 2D 0 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
                        "textureGather(1, x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)))"},
        // OpImageGather 2D Array ConstOffset signed
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageGather "
            "%v4float %sampled_image %coords123 %int_1 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            "textureGather(1, x_20, x_10, coords123.xy, "
            "i32(round(coords123.z)), vec2<i32>(3, 4))"},
        // OpImageGather 2D Array ConstOffset unsigned
        ImageAccessCase{"%float 2D 0 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1 ConstOffset "
                        "%u_offsets2d",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
                        "textureGather(1, x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)), "
                        "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageGather Cube
        ImageAccessCase{"%float Cube 0 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_cube<f32>;)",
                        "textureGather(1, x_20, x_10, coords123)"},
        // OpImageGather Cube Array
        ImageAccessCase{"%float Cube 0 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords1234 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_cube_array<f32>;)",
                        "textureGather(1, x_20, x_10, coords1234.xyz, "
                        "i32(round(coords1234.w)))"},
        // OpImageGather 2DDepth
        ImageAccessCase{"%float 2D 1 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords12 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
                        "textureGather(x_20, x_10, coords12)"},
        // OpImageGather 2DDepth ConstOffset signed
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageGather "
            "%v4float %sampled_image %coords12 %int_1 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
            "textureGather(x_20, x_10, coords12, vec2<i32>(3, 4))"},
        // OpImageGather 2DDepth ConstOffset unsigned
        ImageAccessCase{"%float 2D 1 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords12 %int_1 ConstOffset "
                        "%u_offsets2d",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
                        "textureGather(x_20, x_10, coords12, "
                        "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageGather 2DDepth Array
        ImageAccessCase{"%float 2D 1 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
                        "textureGather(x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)))"},
        // OpImageGather 2DDepth Array ConstOffset signed
        ImageAccessCase{
            "%float 2D 1 1 0 1 Unknown",
            "%result = OpImageGather "
            "%v4float %sampled_image %coords123 %int_1 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            "textureGather(x_20, x_10, coords123.xy, "
            "i32(round(coords123.z)), vec2<i32>(3, 4))"},
        // OpImageGather 2DDepth Array ConstOffset unsigned
        ImageAccessCase{"%float 2D 1 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1 ConstOffset "
                        "%u_offsets2d",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
                        "textureGather(x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)), "
                        "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageGather DepthCube
        ImageAccessCase{"%float Cube 1 0 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords123 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_cube;)",
                        "textureGather(x_20, x_10, coords123)"},
        // OpImageGather DepthCube Array
        ImageAccessCase{"%float Cube 1 1 0 1 Unknown",
                        "%result = OpImageGather "
                        "%v4float %sampled_image %coords1234 %int_1",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_cube_array;)",
                        "textureGather(x_20, x_10, coords1234.xyz, "
                        "i32(round(coords1234.w)))"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageDrefGather,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // OpImageDrefGather 2DDepth
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageDrefGather "
            "%v4float %sampled_image %coords12 %depth",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
            "textureGatherCompare(x_20, x_10, coords12, 0.200000003)"},
        // OpImageDrefGather 2DDepth ConstOffset signed
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageDrefGather "
            "%v4float %sampled_image %coords12 %depth ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
            "textureGatherCompare(x_20, x_10, coords12, 0.200000003, "
            "vec2<i32>(3, 4))"},
        // OpImageDrefGather 2DDepth ConstOffset unsigned
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageDrefGather "
            "%v4float %sampled_image %coords12 %depth ConstOffset "
            "%u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;)",
            "textureGatherCompare(x_20, x_10, coords12, 0.200000003, "
            "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageDrefGather 2DDepth Array
        ImageAccessCase{"%float 2D 1 1 0 1 Unknown",
                        "%result = OpImageDrefGather "
                        "%v4float %sampled_image %coords123 %depth",
                        R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
                        "textureGatherCompare(x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)), 0.200000003)"},
        // OpImageDrefGather 2DDepth Array ConstOffset signed
        ImageAccessCase{
            "%float 2D 1 1 0 1 Unknown",
            "%result = OpImageDrefGather "
            "%v4float %sampled_image %coords123 %depth ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            "textureGatherCompare(x_20, x_10, coords123.xy, "
            "i32(round(coords123.z)), 0.200000003, vec2<i32>(3, 4))"},
        // OpImageDrefGather 2DDepth Array ConstOffset unsigned
        ImageAccessCase{"%float 2D 1 1 0 1 Unknown",
                        "%result = OpImageDrefGather "
                        "%v4float %sampled_image %coords123 %depth ConstOffset "
                        "%u_offsets2d",
                        R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
                        "textureGatherCompare(x_20, x_10, coords123.xy, "
                        "i32(round(coords123.z)), 0.200000003, "
                        "vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageDrefGather DepthCube
        ImageAccessCase{
            "%float Cube 1 0 0 1 Unknown",
            "%result = OpImageDrefGather "
            "%v4float %sampled_image %coords123 %depth",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_cube;)",
            "textureGatherCompare(x_20, x_10, coords123, 0.200000003)"},
        // OpImageDrefGather DepthCube Array
        ImageAccessCase{"%float Cube 1 1 0 1 Unknown",
                        "%result = OpImageDrefGather "
                        "%v4float %sampled_image %coords1234 %depth",
                        R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_cube_array;)",
                        "textureGatherCompare(x_20, x_10, coords1234.xyz, "
                        "i32(round(coords1234.w)), 0.200000003)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleImplicitLod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleImplicitLod
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown",
                        "%result = OpImageSampleImplicitLod "
                        "%v4float %sampled_image %coords12",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
                        "textureSample(x_20, x_10, coords12)"},

        // OpImageSampleImplicitLod arrayed
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords123",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            "textureSample(x_20, x_10, coords123.xy, i32(round(coords123.z)))"},

        // OpImageSampleImplicitLod with ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords12 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            "textureSample(x_20, x_10, coords12, vec2<i32>(3, 4))"},

        // OpImageSampleImplicitLod arrayed with ConstOffset
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords123 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSample(x_20, x_10, coords123.xy, i32(round(coords123.z)), vec2<i32>(3, 4)))"},

        // OpImageSampleImplicitLod with Bias
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown",
                        "%result = OpImageSampleImplicitLod "
                        "%v4float %sampled_image %coords12 Bias %float_7",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
                        "textureSampleBias(x_20, x_10, coords12, 7.0)"},

        // OpImageSampleImplicitLod arrayed with Bias
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords123 Bias %float_7",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleBias(x_20, x_10, coords123.xy, i32(round(coords123.z)), 7.0))"},

        // OpImageSampleImplicitLod with Bias and signed ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords12 Bias|ConstOffset "
            "%float_7 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleBias(x_20, x_10, coords12, 7.0, vec2<i32>(3, 4))"},

        // OpImageSampleImplicitLod with Bias and unsigned ConstOffset
        // Convert ConstOffset to signed
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords12 Bias|ConstOffset "
            "%float_7 %u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleBias(x_20, x_10, coords12, 7.0, vec2<i32>(vec2<u32>(3u, 4u)))"},
        // OpImageSampleImplicitLod arrayed with Bias
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleImplicitLod "
            "%v4float %sampled_image %coords123 Bias|ConstOffset "
            "%float_7 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleBias(x_20, x_10, coords123.xy, i32(round(coords123.z)), 7.0, vec2<i32>(3, 4))"}));

INSTANTIATE_TEST_SUITE_P(
    // This test shows the use of a sampled image used with both regular
    // sampling and depth-reference sampling.  The texture is a depth-texture,
    // and we use builtins textureSample and textureSampleCompare
    ImageSampleImplicitLod_BothDrefAndNonDref,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleImplicitLod
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown", R"(
     %sam_dref = OpLoad %sampler %30
     %sampled_dref_image = OpSampledImage %si_ty %im %sam_dref

     %200 = OpImageSampleImplicitLod %v4float %sampled_image %coords12
     %210 = OpImageSampleDrefImplicitLod %float %sampled_dref_image %coords12 %depth
)",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;

@group(0) @binding(1) var x_30 : sampler_comparison;
)",
                        R"(
  let x_200 : vec4<f32> = vec4<f32>(textureSample(x_20, x_10, coords12), 0.0, 0.0, 0.0);
  let x_210 : f32 = textureSampleCompare(x_20, x_30, coords12, 0.200000003);
)"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleDrefImplicitLod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(
        // ImageSampleDrefImplicitLod
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleDrefImplicitLod "
            "%float %sampled_image %coords12 %depth",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompare(x_20, x_10, coords12, 0.200000003))"},
        // ImageSampleDrefImplicitLod - arrayed
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleDrefImplicitLod "
            "%float %sampled_image %coords123 %depth",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            R"(textureSampleCompare(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.200000003))"},
        // ImageSampleDrefImplicitLod with ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleDrefImplicitLod %float "
            "%sampled_image %coords12 %depth ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompare(x_20, x_10, coords12, 0.200000003, vec2<i32>(3, 4)))"},
        // ImageSampleDrefImplicitLod arrayed with ConstOffset
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleDrefImplicitLod %float "
            "%sampled_image %coords123 %depth ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            R"(textureSampleCompare(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.200000003, vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleDrefExplicitLod,
    SpvParserHandleTest_SampledImageAccessTest,
    // Lod must be float constant 0 due to a Metal constraint.
    // Another test checks cases where the Lod is not float constant 0.
    ::testing::Values(
        // 2D
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod "
            "%float %sampled_image %coords12 %depth Lod %float_0",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompareLevel(x_20, x_10, coords12, 0.200000003))"},
        // 2D array
        ImageAccessCase{
            "%float 2D 1 1 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod "
            "%float %sampled_image %coords123 %depth Lod %float_0",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            R"(textureSampleCompareLevel(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.200000003))"},
        // 2D, ConstOffset
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod %float "
            "%sampled_image %coords12 %depth Lod|ConstOffset "
            "%float_0 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompareLevel(x_20, x_10, coords12, 0.200000003, vec2<i32>(3, 4)))"},
        // 2D array, ConstOffset
        ImageAccessCase{
            "%float 2D 1 1 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod %float "
            "%sampled_image %coords123 %depth Lod|ConstOffset "
            "%float_0 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
            R"(textureSampleCompareLevel(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.200000003, vec2<i32>(3, 4)))"},
        // Cube
        ImageAccessCase{
            "%float Cube 1 0 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod "
            "%float %sampled_image %coords123 %depth Lod %float_0",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_cube;)",
            R"(textureSampleCompareLevel(x_20, x_10, coords123, 0.200000003))"},
        // Cube array
        ImageAccessCase{
            "%float Cube 1 1 0 1 Unknown",
            "%result = OpImageSampleDrefExplicitLod "
            "%float %sampled_image %coords1234 %depth Lod %float_0",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_cube_array;)",
            R"(textureSampleCompareLevel(x_20, x_10, coords1234.xyz, i32(round(coords1234.w)), 0.200000003))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleExplicitLod_UsingLod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleExplicitLod - using Lod
        ImageAccessCase{"%float 2D 0 0 0 1 Unknown",
                        "%result = OpImageSampleExplicitLod "
                        "%v4float %sampled_image %coords12 Lod %float_null",
                        R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
                        R"(textureSampleLevel(x_20, x_10, coords12, 0.0))"},

        // OpImageSampleExplicitLod arrayed - using Lod
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords123 Lod %float_null",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleLevel(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.0))"},

        // OpImageSampleExplicitLod - using Lod and ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords12 Lod|ConstOffset "
            "%float_null %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleLevel(x_20, x_10, coords12, 0.0, vec2<i32>(3, 4)))"},

        // OpImageSampleExplicitLod - using Lod and unsigned ConstOffset
        // Convert the ConstOffset operand to signed
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords12 Lod|ConstOffset "
            "%float_null %u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleLevel(x_20, x_10, coords12, 0.0, vec2<i32>(vec2<u32>(3u, 4u)))"},

        // OpImageSampleExplicitLod arrayed - using Lod and ConstOffset
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords123 Lod|ConstOffset "
            "%float_null %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleLevel(x_20, x_10, coords123.xy, i32(round(coords123.z)), 0.0, vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleExplicitLod_UsingGrad,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleExplicitLod - using Grad
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords12 Grad %vf12 %vf21",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords12, vf12, vf21))"},

        // OpImageSampleExplicitLod arrayed - using Grad
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords123 Grad %vf12 %vf21",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords123.xy, i32(round(coords123.z)), vf12, vf21))"},

        // OpImageSampleExplicitLod - using Grad and ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords12 Grad|ConstOffset "
            "%vf12 %vf21 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords12, vf12, vf21, vec2<i32>(3, 4)))"},

        // OpImageSampleExplicitLod - using Grad and unsigned ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords12 Grad|ConstOffset "
            "%vf12 %vf21 %u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords12, vf12, vf21, vec2<i32>(vec2<u32>(3u, 4u)))"},

        // OpImageSampleExplicitLod arrayed - using Grad and ConstOffset
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords123 Grad|ConstOffset "
            "%vf12 %vf21 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords123.xy, i32(round(coords123.z)), vf12, vf21, vec2<i32>(3, 4)))"},

        // OpImageSampleExplicitLod arrayed - using Grad and unsigned
        // ConstOffset
        ImageAccessCase{
            "%float 2D 0 1 0 1 Unknown",
            "%result = OpImageSampleExplicitLod "
            "%v4float %sampled_image %coords123 Grad|ConstOffset "
            "%vf12 %vf21 %u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
            R"(textureSampleGrad(x_20, x_10, coords123.xy, i32(round(coords123.z)), vf12, vf21, vec2<i32>(vec2<u32>(3u, 4u))))"}));

// Test crbug.com/378:
// In WGSL, sampling from depth texture with explicit level of detail
// requires the Lod parameter as an unsigned integer.
// This corresponds to SPIR-V OpSampleExplicitLod and WGSL textureSampleLevel.
INSTANTIATE_TEST_SUITE_P(
    ImageSampleExplicitLod_DepthTexture,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Test a non-depth case.
        // (This is already tested above in the ImageSampleExplicitLod suite,
        // but I'm repeating here for the contrast with the depth case.)
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4float "
         "%sampled_image %vf12 Lod %f1",
         R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(textureSampleLevel(x_20, x_10, vf12, f1))"},
        // Test a depth case
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4float "
         "%sampled_image %vf12 Lod %f1",
         R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
         R"(vec4<f32>(textureSampleLevel(x_20, x_10, vf12, i32(f1)), 0.0, 0.0, 0.0))"}}));

/////
// Projection sampling
/////

// Test matrix for projection sampling:
// sampling
//   Dimensions: 1D, 2D, 3D, 2DShadow
//   Variations: Proj { ImplicitLod { | Bias } | ExplicitLod { Lod | Grad | } }
//   x { | ConstOffset }
// depth-compare sampling
//   Dimensions: 2D
//   Variations: Proj Dref { ImplicitLod { | Bias } | ExplicitLod { Lod | Grad |
//   } } x { | ConstOffset }
//
// Expanded:
//    ImageSampleProjImplicitLod        // { | ConstOffset }
//    ImageSampleProjImplicitLod_Bias   // { | ConstOffset }
//    ImageSampleProjExplicitLod_Lod    // { | ConstOffset }
//    ImageSampleProjExplicitLod_Grad   // { | ConstOffset }
//
//    ImageSampleProjImplicitLod_DepthTexture
//
//    ImageSampleProjDrefImplicitLod        // { | ConstOffset }
//    ImageSampleProjDrefExplicitLod_Lod    // { | ConstOffset }

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjImplicitLod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleProjImplicitLod 1D
        ImageAccessCase{
            "%float 1D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords12",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_1d<f32>;)",
            R"(textureSample(x_20, x_10, (coords12.x / coords12.y)))"},

        // OpImageSampleProjImplicitLod 2D
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSample(x_20, x_10, (coords123.xy / coords123.z)))"},

        // OpImageSampleProjImplicitLod 3D
        ImageAccessCase{
            "%float 3D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords1234",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_3d<f32>;)",
            R"(textureSample(x_20, x_10, (coords1234.xyz / coords1234.w)))"},

        // OpImageSampleProjImplicitLod 2D with ConstOffset
        // (Don't need to test with 1D or 3D, as the hard part was the splatted
        // division.) This case tests handling of the ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSample(x_20, x_10, (coords123.xy / coords123.z), vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjImplicitLod_Bias,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleProjImplicitLod with Bias
        // Only testing 2D
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123 Bias %float_7",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleBias(x_20, x_10, (coords123.xy / coords123.z), 7.0))"},

        // OpImageSampleProjImplicitLod with Bias and signed ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123 Bias|ConstOffset "
            "%float_7 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleBias(x_20, x_10, (coords123.xy / coords123.z), 7.0, vec2<i32>(3, 4)))"},

        // OpImageSampleProjImplicitLod with Bias and unsigned ConstOffset
        // Convert ConstOffset to signed
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123 Bias|ConstOffset "
            "%float_7 %u_offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleBias(x_20, x_10, (coords123.xy / coords123.z), 7.0, vec2<i32>(vec2<u32>(3u, 4u))))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjExplicitLod_Lod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(
        // OpImageSampleProjExplicitLod 2D
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjExplicitLod "
            "%v4float %sampled_image %coords123 Lod %f1",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleLevel(x_20, x_10, (coords123.xy / coords123.z), f1))"},

        // OpImageSampleProjExplicitLod 2D Lod with ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjExplicitLod "
            "%v4float %sampled_image %coords123 Lod|ConstOffset %f1 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleLevel(x_20, x_10, (coords123.xy / coords123.z), f1, vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjExplicitLod_Grad,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(
        // OpImageSampleProjExplicitLod 2D Grad
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjExplicitLod "
            "%v4float %sampled_image %coords123 Grad %vf12 %vf21",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleGrad(x_20, x_10, (coords123.xy / coords123.z), vf12, vf21))"},

        // OpImageSampleProjExplicitLod 2D Lod Grad ConstOffset
        ImageAccessCase{
            "%float 2D 0 0 0 1 Unknown",
            "%result = OpImageSampleProjExplicitLod "
            "%v4float %sampled_image %coords123 Grad|ConstOffset "
            "%vf12 %vf21 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
            R"(textureSampleGrad(x_20, x_10, (coords123.xy / coords123.z), vf12, vf21, vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    // Ordinary (non-comparison) sampling on a depth texture.
    ImageSampleProjImplicitLod_DepthTexture,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(
        // OpImageSampleProjImplicitLod 2D depth
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleProjImplicitLod "
            "%v4float %sampled_image %coords123",
            R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            // Sampling the depth texture yields an f32, but the
            // SPIR-V operation yiedls vec4<f32>, so fill out the
            // remaining components with 0.
            R"(vec4<f32>(textureSample(x_20, x_10, (coords123.xy / coords123.z)), 0.0, 0.0, 0.0))"}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjDrefImplicitLod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // OpImageSampleProjDrefImplicitLod 2D depth-texture
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleProjDrefImplicitLod "
            "%float %sampled_image %coords123 %f1",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompare(x_20, x_10, (coords123.xy / coords123.z), f1))"},

        // OpImageSampleProjDrefImplicitLod 2D depth-texture, ConstOffset
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleProjDrefImplicitLod "
            "%float %sampled_image %coords123 %f1 ConstOffset %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompare(x_20, x_10, (coords123.xy / coords123.z), f1, vec2<i32>(3, 4)))"}));

INSTANTIATE_TEST_SUITE_P(
    DISABLED_ImageSampleProjDrefExplicitLod_Lod,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::Values(

        // Lod must be float constant 0 due to a Metal constraint.
        // Another test checks cases where the Lod is not float constant 0.

        // OpImageSampleProjDrefExplicitLod 2D depth-texture Lod
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleProjDrefExplicitLod "
            "%float %sampled_image %coords123 %depth Lod %float_0",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompare(x_20, x_10, (coords123.xy / coords123.z), 0.200000003, 0.0))"},

        // OpImageSampleProjDrefImplicitLod 2D depth-texture, Lod ConstOffset
        ImageAccessCase{
            "%float 2D 1 0 0 1 Unknown",
            "%result = OpImageSampleProjDrefExplicitLod "
            "%float %sampled_image %coords123 %depth "
            "Lod|ConstOffset %float_0 %offsets2d",
            R"(@group(0) @binding(0) var x_10 : sampler_comparison;

@group(2) @binding(1) var x_20 : texture_depth_2d;
)",
            R"(textureSampleCompareLevel(x_20, x_10, (coords123.xy / coords123.z), 0.200000003, 0.0, vec2<i32>(3, 4)))"}));

/////
// End projection sampling
/////

using SpvParserHandleTest_ImageAccessTest =
    SpvParserTestBase<::testing::TestWithParam<ImageAccessCase>>;

TEST_P(SpvParserHandleTest_ImageAccessTest, Variable) {
  // In this test harness, we only create an image.
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %main "main"
     OpExecutionMode %main OriginUpperLeft
     OpName %f1 "f1"
     OpName %vf12 "vf12"
     OpName %vf123 "vf123"
     OpName %vf1234 "vf1234"
     OpName %u1 "u1"
     OpName %vu12 "vu12"
     OpName %vu123 "vu123"
     OpName %vu1234 "vu1234"
     OpName %i1 "i1"
     OpName %vi12 "vi12"
     OpName %vi123 "vi123"
     OpName %vi1234 "vi1234"
     OpName %offsets2d "offsets2d"
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
)" + CommonBasicTypes() +
                        R"(
     %im_ty = OpTypeImage )" +
                        GetParam().spirv_image_type_details + R"(
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty
     %20 = OpVariable %ptr_im_ty UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %f1 = OpCopyObject %float %float_1
     %vf12 = OpCopyObject %v2float %the_vf12
     %vf123 = OpCopyObject %v3float %the_vf123
     %vf1234 = OpCopyObject %v4float %the_vf1234

     %i1 = OpCopyObject %int %int_1
     %vi12 = OpCopyObject %v2int %the_vi12
     %vi123 = OpCopyObject %v3int %the_vi123
     %vi1234 = OpCopyObject %v4int %the_vi1234

     %u1 = OpCopyObject %uint %uint_1
     %vu12 = OpCopyObject %v2uint %the_vu12
     %vu123 = OpCopyObject %v3uint %the_vu123
     %vu1234 = OpCopyObject %v4uint %the_vu1234

     %value_offset = OpCompositeConstruct %v2int %int_3 %int_4
     %offsets2d = OpCopyObject %v2int %value_offset
     %im = OpLoad %im_ty %20

)" + GetParam().spirv_image_access +
                        R"(
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  ASSERT_TRUE(p->BuildAndParseInternalModule()) << p->error() << assembly;
  EXPECT_TRUE(p->error().empty()) << p->error();
  const auto program = test::ToString(p->program());
  EXPECT_THAT(program, HasSubstr(GetParam().var_decl))
      << "DECLARATIONS ARE BAD " << program;
  EXPECT_THAT(program, HasSubstr(GetParam().texture_builtin))
      << "TEXTURE BUILTIN IS BAD " << program << assembly;
}

INSTANTIATE_TEST_SUITE_P(ImageWrite_OptionalParams,
                         SpvParserHandleTest_ImageAccessTest,
                         ::testing::ValuesIn(std::vector<ImageAccessCase>{
                             // OpImageWrite with no extra params
                             {"%float 2D 0 0 0 2 Rgba32f",
                              "OpImageWrite %im %vi12 %vf1234",
                              "@group(2) @binding(1) var x_20 : "
                              "texture_storage_2d<rgba32float, write>;",
                              "textureStore(x_20, vi12, vf1234);"}}));

INSTANTIATE_TEST_SUITE_P(
    // SPIR-V's texel parameter is a scalar or vector with at least as many
    // components as there are channels in the underlying format, and the
    // componet type matches the sampled type (modulo signed/unsigned integer).
    // WGSL's texel parameter is a 4-element vector scalar or vector, with
    // component type equal to the 32-bit form of the channel type.
    ImageWrite_ConvertTexelOperand_Arity,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Source 1 component
        {"%float 2D 0 0 0 2 R32f", "OpImageWrite %im %vi12 %f1",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32float, write>;)",
         "textureStore(x_20, vi12, vec4<f32>(f1, 0.0, 0.0, 0.0));"},
        // Source 2 component, dest 1 component
        {"%float 2D 0 0 0 2 R32f", "OpImageWrite %im %vi12 %vf12",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32float, write>;)",
         "textureStore(x_20, vi12, vec4<f32>(vf12, 0.0, 0.0));"},
        // Source 3 component, dest 1 component
        {"%float 2D 0 0 0 2 R32f", "OpImageWrite %im %vi12 %vf123",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32float, write>;)",
         "textureStore(x_20, vi12, vec4<f32>(vf123, 0.0));"},
        // Source 4 component, dest 1 component
        {"%float 2D 0 0 0 2 R32f", "OpImageWrite %im %vi12 %vf1234",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32float, write>;)",
         "textureStore(x_20, vi12, vf1234);"},
        // Source 2 component, dest 2 component
        {"%float 2D 0 0 0 2 Rg32f", "OpImageWrite %im %vi12 %vf12",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rg32float, write>;)",
         "textureStore(x_20, vi12, vec4<f32>(vf12, 0.0, 0.0));"},
        // Source 3 component, dest 2 component
        {"%float 2D 0 0 0 2 Rg32f", "OpImageWrite %im %vi12 %vf123",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rg32float, write>;)",
         "textureStore(x_20, vi12, vec4<f32>(vf123, 0.0));"},
        // Source 4 component, dest 2 component
        {"%float 2D 0 0 0 2 Rg32f", "OpImageWrite %im %vi12 %vf1234",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rg32float, write>;)",
         "textureStore(x_20, vi12, vf1234);"},
        // WGSL does not support 3-component storage textures.
        // Source 4 component, dest 4 component
        {"%float 2D 0 0 0 2 Rgba32f", "OpImageWrite %im %vi12 %vf1234",
         "@group(2) @binding(1) var x_20 : "
         "texture_storage_2d<rgba32float, write>;",
         "textureStore(x_20, vi12, vf1234);"}}));

TEST_F(SpvParserHandleTest, ImageWrite_TooFewSrcTexelComponents_1_vs_4) {
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %main "main"
     OpExecutionMode %main OriginUpperLeft
     OpName %f1 "f1"
     OpName %coords12 "coords12"
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
)" + CommonBasicTypes() +
                        R"(
     %im_ty = OpTypeImage %void 2D 0 0 0 2 Rgba32f
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty

     %20 = OpVariable %ptr_im_ty UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %f1 = OpCopyObject %float %float_1

     %coords12 = OpCopyObject %v2float %the_vf12

     %im = OpLoad %im_ty %20
     OpImageWrite %im %coords12 %f1
     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  EXPECT_FALSE(p->BuildAndParseInternalModule());
  EXPECT_THAT(p->error(),
              Eq("texel has too few components for storage texture: 1 provided "
                 "but 4 required, in: OpImageWrite %54 %3 %2"))
      << p->error();
}

TEST_F(SpvParserHandleTest, ImageWrite_ThreeComponentStorageTexture_IsError) {
  // SPIR-V doesn't allow a 3-element storage texture format.
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %main "main"
     OpExecutionMode %main OriginUpperLeft
     OpName %vf123 "vf123"
     OpName %coords12 "coords12"
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
)" + CommonBasicTypes() +
                        R"(
     %im_ty = OpTypeImage %void 2D 0 0 0 2 Rgb32f
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty

     %20 = OpVariable %ptr_im_ty UniformConstant

     %main = OpFunction %void None %voidfn
     %entry = OpLabel

     %vf123 = OpCopyObject %v3float %the_vf123

     %coords12 = OpCopyObject %v2float %the_vf12

     %im = OpLoad %im_ty %20
     OpImageWrite %im %coords12 %vf123
     OpReturn
     OpFunctionEnd
  )";
  auto error = test::AssembleFailure(assembly);
  EXPECT_THAT(error, HasSubstr("Invalid image format 'Rgb32f'"));
}

INSTANTIATE_TEST_SUITE_P(
    // The texel operand signedness must match the channel type signedness.
    // SPIR-V validation checks that.
    // This suite is for the cases where they are integral and the same
    // signedness.
    ImageWrite_ConvertTexelOperand_SameSignedness,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Sampled type is unsigned int, texel is unsigned int
        {"%uint 2D 0 0 0 2 Rgba32ui", "OpImageWrite %im %vi12 %vu1234",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32uint, write>;)",
         R"(textureStore(x_20, vi12, vu1234))"},
        // Sampled type is signed int, texel is signed int
        {"%int 2D 0 0 0 2 Rgba32i", "OpImageWrite %im %vi12 %vi1234",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32sint, write>;)",
         R"(textureStore(x_20, vi12, vi1234))"}}));

INSTANTIATE_TEST_SUITE_P(
    // Error out when OpImageWrite write texel differ in float vs. integral
    ImageWrite_ConvertTexelOperand_DifferentFloatishness_IsError,
    // Use the ImageDeclTest so we can check the error.
    SpvParserHandleTest_ImageDeclTest,
    ::testing::ValuesIn(std::vector<ImageDeclCase>{
        // Sampled type is float, texel is signed int
        {"%uint 2D 0 0 0 2 Rgba32f", "OpImageWrite %im %vi12 %vi1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32float, write>;)"},
        // Sampled type is float, texel is unsigned int
        {"%int 2D 0 0 0 2 Rgba32f", "OpImageWrite %im %vi12 %vu1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32float, write>;)"},
        // Sampled type is unsigned int, texel is float
        {"%uint 2D 0 0 0 2 Rgba32ui", "OpImageWrite %im %vi12 %vf1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32uint, write>;)"},
        // Sampled type is signed int, texel is float
        {"%int 2D 0 0 0 2 Rgba32i", "OpImageWrite %im %vi12 %vf1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32sint, write>;
  })"}}));

INSTANTIATE_TEST_SUITE_P(
    // Error out when OpImageWrite write texel signedness is different.
    ImageWrite_ConvertTexelOperand_DifferentSignedness_IsError,
    // Use the ImageDeclTest so we can check the error.
    SpvParserHandleTest_ImageDeclTest,
    ::testing::ValuesIn(std::vector<ImageDeclCase>{
        // Sampled type is unsigned int, texel is signed int
        {"%uint 2D 0 0 0 2 Rgba32ui", "OpImageWrite %im %vi12 %vi1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32uint, write>;)"},
        // Sampled type is signed int, texel is unsigned int
        {"%int 2D 0 0 0 2 Rgba32i", "OpImageWrite %im %vi12 %vu1234",
         "invalid texel type for storage texture write: component must be "
         "float, signed integer, or unsigned integer to match the texture "
         "channel type: OpImageWrite",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<rgba32sint, write>;
  })"}}));

INSTANTIATE_TEST_SUITE_P(
    // Show that zeros of the correct integer signedness are
    // created when expanding an integer vector.
    ImageWrite_ConvertTexelOperand_Signedness_AndWidening,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Source unsigned, dest unsigned
        {"%uint 2D 0 0 0 2 R32ui", "OpImageWrite %im %vi12 %vu12",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32uint, write>;)",
         R"(textureStore(x_20, vi12, vec4<u32>(vu12, 0u, 0u)))"},
        // Source signed, dest signed
        {"%int 2D 0 0 0 2 R32i", "OpImageWrite %im %vi12 %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_storage_2d<r32sint, write>;)",
         R"(textureStore(x_20, vi12, vec4<i32>(vi12, 0, 0)))"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageFetch_OptionalParams,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // OpImageFetch with no extra params, on sampled texture
        // Level of detail is injected for sampled texture
        {"%float 2D 0 0 0 1 Unknown", "%99 = OpImageFetch %v4float %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, 0);)"},
        // OpImageFetch with explicit level, on sampled texture
        {"%float 2D 0 0 0 1 Unknown",
         "%99 = OpImageFetch %v4float %im %vi12 Lod %int_3",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, 3);)"},
        // OpImageFetch with no extra params, on depth texture
        // Level of detail is injected for depth texture
        {"%float 2D 1 0 0 1 Unknown", "%99 = OpImageFetch %v4float %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d;)",
         R"(let x_99 : vec4<f32> = vec4<f32>(textureLoad(x_20, vi12, 0), 0.0, 0.0, 0.0);)"},
        // OpImageFetch with extra params, on depth texture
        {"%float 2D 1 0 0 1 Unknown",
         "%99 = OpImageFetch %v4float %im %vi12 Lod %int_3",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d;)",
         R"(let x_99 : vec4<f32> = vec4<f32>(textureLoad(x_20, vi12, 3), 0.0, 0.0, 0.0);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageFetch_Depth,
    // In SPIR-V OpImageFetch always yields a vector of 4
    // elements, even for depth images.  But in WGSL,
    // textureLoad on a depth image yields f32.
    // crbug.com/tint/439
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // ImageFetch on depth image.
        {"%float 2D 1 0 0 1 Unknown", "%99 = OpImageFetch %v4float %im %vi12 ",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d;)",
         R"(let x_99 : vec4<f32> = vec4<f32>(textureLoad(x_20, vi12, 0), 0.0, 0.0, 0.0);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageFetch_DepthMultisampled,
    // In SPIR-V OpImageFetch always yields a vector of 4
    // elements, even for depth images.  But in WGSL,
    // textureLoad on a depth image yields f32.
    // crbug.com/tint/439
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // ImageFetch on multisampled depth image.
        {"%float 2D 1 0 1 1 Unknown",
         "%99 = OpImageFetch %v4float %im %vi12 Sample %i1",
         R"(@group(2) @binding(1) var x_20 : texture_depth_multisampled_2d;)",
         R"(let x_99 : vec4<f32> = vec4<f32>(textureLoad(x_20, vi12, i1), 0.0, 0.0, 0.0);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageFetch_Multisampled,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // SPIR-V requires a Sample image operand when operating on a
        // multisampled image.

        // ImageFetch arrayed
        // Not in WebGPU

        // ImageFetch non-arrayed
        {"%float 2D 0 0 1 1 Unknown",
         "%99 = OpImageFetch %v4float %im %vi12 Sample %i1",
         R"(@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, i1);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageFetch_Multisampled_ConvertSampleOperand,
    SpvParserHandleTest_ImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        {"%float 2D 0 0 1 1 Unknown",
         "%99 = OpImageFetch %v4float %im %vi12 Sample %u1",
         R"(@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, i32(u1));)"}}));

INSTANTIATE_TEST_SUITE_P(
    ConvertResultSignedness,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Valid SPIR-V only has:
        //      float scalar sampled type vs. floating result
        //      integral scalar sampled type vs. integral result
        // Any of the sampling, reading, or fetching use the same codepath.

        // We'll test with:
        //     OpImageFetch
        //     OpImageRead
        //     OpImageSampleImplicitLod - representative of sampling

        //
        // OpImageRead
        //

        // OpImageFetch requires no conversion, float -> v4float
        {"%float 2D 0 0 0 1 Unknown", "%99 = OpImageFetch %v4float %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, 0);)"},
        // OpImageFetch requires no conversion, uint -> v4uint
        {"%uint 2D 0 0 0 1 Unknown", "%99 = OpImageFetch %v4uint %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<u32>;)",
         R"(let x_99 : vec4<u32> = textureLoad(x_20, vi12, 0);)"},
        // OpImageFetch requires conversion, uint -> v4int
        // is invalid SPIR-V:
        // "Expected Image 'Sampled Type' to be the same as Result Type
        // components"

        // OpImageFetch requires no conversion, int -> v4int
        {"%int 2D 0 0 0 1 Unknown", "%99 = OpImageFetch %v4int %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<i32>;)",
         R"(let x_99 : vec4<i32> = textureLoad(x_20, vi12, 0);)"},
        // OpImageFetch requires conversion, int -> v4uint
        // is invalid SPIR-V:
        // "Expected Image 'Sampled Type' to be the same as Result Type
        // components"

        //
        // OpImageRead
        //

        // OpImageRead requires no conversion, float -> v4float
        {"%float 2D 0 0 0 2 Rgba32f", "%99 = OpImageRead %v4float %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureLoad(x_20, vi12, 0);)"},
        // OpImageRead requires no conversion, uint -> v4uint
        {"%uint 2D 0 0 0 2 Rgba32ui", "%99 = OpImageRead %v4uint %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<u32>;)",
         R"(let x_99 : vec4<u32> = textureLoad(x_20, vi12, 0);)"},

        // OpImageRead requires conversion, uint -> v4int
        // is invalid SPIR-V:
        // "Expected Image 'Sampled Type' to be the same as Result Type
        // components"

        // OpImageRead requires no conversion, int -> v4int
        {"%int 2D 0 0 0 2 Rgba32i", "%99 = OpImageRead %v4int %im %vi12",
         R"(@group(2) @binding(1) var x_20 : texture_2d<i32>;)",
         R"(let x_99 : vec4<i32> = textureLoad(x_20, vi12, 0);)"},

        // OpImageRead requires conversion, int -> v4uint
        // is invalid SPIR-V:
        // "Expected Image 'Sampled Type' to be the same as Result Type
        // components"

        //
        // Sampling operations, using OpImageSampleImplicitLod as an example.
        // WGSL sampling operations only work on textures with a float sampled
        // component.  So we can only test the float -> float (non-conversion)
        // case.

        // OpImageSampleImplicitLod requires no conversion, float -> v4float
        {"%float 2D 0 0 0 1 Unknown",
         "%99 = OpImageSampleImplicitLod %v4float %sampled_image %vf12",
         R"(@group(0) @binding(0) var x_10 : sampler;

@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec4<f32> = textureSample(x_20, x_10, vf12);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageQuerySize_NonArrayed_SignedResult,
    // ImageQuerySize requires storage image or multisampled
    // For storage image, use another instruction to indicate whether it
    // is readonly or writeonly.
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // 1D storage image
        {"%float 1D 0 0 0 2 Rgba32f",
         "%99 = OpImageQuerySize %int %im \n"
         "%98 = OpImageRead %v4float %im %i1\n",  // Implicitly mark as
                                                  // NonWritable
         R"(@group(2) @binding(1) var x_20 : texture_1d<f32>;)",
         R"(let x_99 : i32 = i32(textureDimensions(x_20));)"},
        // 2D storage image
        {"%float 2D 0 0 0 2 Rgba32f",
         "%99 = OpImageQuerySize %v2int %im \n"
         "%98 = OpImageRead %v4float %im %vi12\n",  // Implicitly mark as
                                                    // NonWritable
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20))"},
        // 3D storage image
        {"%float 3D 0 0 0 2 Rgba32f",
         "%99 = OpImageQuerySize %v3int %im \n"
         "%98 = OpImageRead %v4float %im %vi123\n",  // Implicitly mark as
                                                     // NonWritable
         R"(@group(2) @binding(1) var x_20 : texture_3d<f32>;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20));)"},

        // Multisampled
        {"%float 2D 0 0 1 1 Unknown", "%99 = OpImageQuerySize %v2int %im \n",
         R"(@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20));)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageQuerySize_Arrayed_SignedResult,
    // ImageQuerySize requires storage image or multisampled
    // For storage image, use another instruction to indicate whether it
    // is readonly or writeonly.
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // 1D array storage image doesn't exist.

        // 2D array storage image
        {"%float 2D 0 1 0 2 Rgba32f",
         "%99 = OpImageQuerySize %v3int %im \n"
         "%98 = OpImageRead %v4float %im %vi123\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20), textureNumLayers(x_20));)"}
        // 3D array storage image doesn't exist.

        // Multisampled array
        // Not in WebGPU
    }));

INSTANTIATE_TEST_SUITE_P(
    ImageQuerySizeLod_NonArrayed_SignedResult_SignedLevel,
    // From VUID-StandaloneSpirv-OpImageQuerySizeLod-04659:
    //  ImageQuerySizeLod requires Sampled=1
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // 1D
        {"%float 1D 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_1d<f32>;)",
         R"(let x_99 : i32 = i32(textureDimensions(x_20, i1)))"},

        // 2D
        {"%float 2D 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v2int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20, i1));)"},

        // 3D
        {"%float 3D 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v3int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_3d<f32>;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20, i1));)"},

        // Cube
        {"%float Cube 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v2int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_cube<f32>;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20, i1).xy);)"},

        // Depth 2D
        {"%float 2D 1 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v2int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20, i1));)"},

        // Depth Cube
        {"%float Cube 1 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v2int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_cube;)",
         R"(let x_99 : vec2<i32> = vec2<i32>(textureDimensions(x_20, i1).xy);)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageQuerySizeLod_Arrayed_SignedResult_SignedLevel,
    // ImageQuerySize requires storage image or multisampled
    // For storage image, use another instruction to indicate whether it
    // is readonly or writeonly.
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{

        // There is no 1D array

        // 2D array
        {"%float 2D 0 1 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v3int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20, i1), textureNumLayers(x_20));)"},

        // There is no 3D array

        // Cube array
        //
        // Currently textureDimension on cube returns vec3 but maybe should
        // return vec2
        // https://github.com/gpuweb/gpuweb/issues/1345
        {"%float Cube 0 1 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v3int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_cube_array<f32>;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20, i1).xy, textureNumLayers(x_20));)"},

        // Depth 2D array
        {"%float 2D 1 1 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v3int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20, i1), textureNumLayers(x_20));)"},

        // Depth Cube Array
        //
        // Currently textureDimension on cube returns vec3 but maybe should
        // return vec2
        // https://github.com/gpuweb/gpuweb/issues/1345
        {"%float Cube 1 1 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %v3int %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_cube_array;)",
         R"(let x_99 : vec3<i32> = vec3<i32>(textureDimensions(x_20, i1).xy, textureNumLayers(x_20));)"}}));

INSTANTIATE_TEST_SUITE_P(
    // When the level-of-detail value is given as an unsigned
    // integer, we must convert it before using it as an argument
    // to textureDimensions.
    ImageQuerySizeLod_NonArrayed_SignedResult_UnsignedLevel,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{

        {"%float 1D 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %int %im %u1\n",
         R"(@group(2) @binding(1) var x_20 : texture_1d<f32>;)",
         R"(let x_99 : i32 = i32(textureDimensions(x_20, i32(u1)));)"}}));

INSTANTIATE_TEST_SUITE_P(
    // When SPIR-V wants the result type to be unsigned, we have to
    // insert a type constructor or bitcast for WGSL to do the type
    // coercion. But the algorithm already does that as a matter
    // of course.
    ImageQuerySizeLod_NonArrayed_UnsignedResult_SignedLevel,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{

        {"%float 1D 0 0 0 1 Unknown",
         "%99 = OpImageQuerySizeLod %uint %im %i1\n",
         R"(@group(2) @binding(1) var x_20 : texture_1d<f32>;)",
         R"(let x_99 : u32 = u32(textureDimensions(x_20, i1));)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageQueryLevels_SignedResult,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // In Vulkan:
        //      Dim must be 1D, 2D, 3D, Cube
        // WGSL allows 2d, 2d_array, 3d, cube, cube_array
        // depth_2d, depth_2d_array, depth_cube, depth_cube_array

        // 2D
        {"%float 2D 0 0 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // 2D array
        {"%float 2D 0 1 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d_array<f32>;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // 3D
        {"%float 3D 0 0 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_3d<f32>;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // Cube
        {"%float Cube 0 0 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_cube<f32>;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // Cube array
        {"%float Cube 0 1 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_cube_array<f32>;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // depth 2d
        {"%float 2D 1 0 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // depth 2d array
        {"%float 2D 1 1 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_2d_array;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // depth cube
        {"%float Cube 1 0 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_cube;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"},

        // depth cube array
        {"%float Cube 1 1 0 1 Unknown", "%99 = OpImageQueryLevels %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_depth_cube_array;)",
         R"(let x_99 : i32 = textureNumLevels(x_20);)"}}));

INSTANTIATE_TEST_SUITE_P(
    // Spot check that a type conversion is inserted when SPIR-V asks for
    // an unsigned int result.
    ImageQueryLevels_UnsignedResult,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        {"%float 2D 0 0 0 1 Unknown", "%99 = OpImageQueryLevels %uint %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_2d<f32>;)",
         R"(let x_99 : u32 = u32(textureNumLevels(x_20));)"}}));

INSTANTIATE_TEST_SUITE_P(
    ImageQuerySamples_SignedResult,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Multsample 2D
        {"%float 2D 0 0 1 1 Unknown", "%99 = OpImageQuerySamples %int %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;)",
         R"(let x_99 : i32 = textureNumSamples(x_20);)"}  // namespace

        // Multisample 2D array
        // Not in WebGPU
    }));

INSTANTIATE_TEST_SUITE_P(
    // Translation must inject a type coersion from signed to unsigned.
    ImageQuerySamples_UnsignedResult,
    SpvParserHandleTest_SampledImageAccessTest,
    ::testing::ValuesIn(std::vector<ImageAccessCase>{
        // Multsample 2D
        {"%float 2D 0 0 1 1 Unknown", "%99 = OpImageQuerySamples %uint %im\n",
         R"(@group(2) @binding(1) var x_20 : texture_multisampled_2d<f32>;)",
         R"(let x_99 : u32 = u32(textureNumSamples(x_20));)"}

        // Multisample 2D array
        // Not in WebGPU
    }));

struct ImageCoordsCase {
  // SPIR-V image type, excluding result ID and opcode
  std::string spirv_image_type_details;
  std::string spirv_image_access;
  std::string expected_error;
  std::vector<std::string> expected_expressions;
};

inline std::ostream& operator<<(std::ostream& out, const ImageCoordsCase& c) {
  out << "ImageCoordsCase(" << c.spirv_image_type_details << "\n"
      << c.spirv_image_access << "\n"
      << "expected_error(" << c.expected_error << ")\n";

  for (auto e : c.expected_expressions) {
    out << e << ",";
  }
  out << ")" << std::endl;
  return out;
}

using SpvParserHandleTest_ImageCoordsTest =
    SpvParserTestBase<::testing::TestWithParam<ImageCoordsCase>>;

TEST_P(SpvParserHandleTest_ImageCoordsTest,
       MakeCoordinateOperandsForImageAccess) {
  // Only declare the sampled image type, and the associated variable
  // if the requested image type is a sampled image type and not multisampled.
  const bool is_sampled_image_type = GetParam().spirv_image_type_details.find(
                                         "0 1 Unknown") != std::string::npos;
  const auto assembly =
      Preamble() + R"(
     OpEntryPoint Fragment %100 "main"
     OpExecutionMode %100 OriginUpperLeft
     OpName %float_var "float_var"
     OpName %ptr_float "ptr_float"
     OpName %i1 "i1"
     OpName %vi12 "vi12"
     OpName %vi123 "vi123"
     OpName %vi1234 "vi1234"
     OpName %u1 "u1"
     OpName %vu12 "vu12"
     OpName %vu123 "vu123"
     OpName %vu1234 "vu1234"
     OpName %f1 "f1"
     OpName %vf12 "vf12"
     OpName %vf123 "vf123"
     OpName %vf1234 "vf1234"
     OpDecorate %10 DescriptorSet 0
     OpDecorate %10 Binding 0
     OpDecorate %20 DescriptorSet 2
     OpDecorate %20 Binding 1
     OpDecorate %30 DescriptorSet 0
     OpDecorate %30 Binding 1
)" + CommonBasicTypes() +
      R"(
     %sampler = OpTypeSampler
     %ptr_sampler = OpTypePointer UniformConstant %sampler
     %im_ty = OpTypeImage )" +
      GetParam().spirv_image_type_details + R"(
     %ptr_im_ty = OpTypePointer UniformConstant %im_ty
)" + (is_sampled_image_type ? " %si_ty = OpTypeSampledImage %im_ty " : "") +
      R"(

     %ptr_float = OpTypePointer Function %float

     %10 = OpVariable %ptr_sampler UniformConstant
     %20 = OpVariable %ptr_im_ty UniformConstant
     %30 = OpVariable %ptr_sampler UniformConstant ; comparison sampler, when needed

     %100 = OpFunction %void None %voidfn
     %entry = OpLabel

     %float_var = OpVariable %ptr_float Function

     %i1 = OpCopyObject %int %int_1
     %vi12 = OpCopyObject %v2int %the_vi12
     %vi123 = OpCopyObject %v3int %the_vi123
     %vi1234 = OpCopyObject %v4int %the_vi1234

     %u1 = OpCopyObject %uint %uint_1
     %vu12 = OpCopyObject %v2uint %the_vu12
     %vu123 = OpCopyObject %v3uint %the_vu123
     %vu1234 = OpCopyObject %v4uint %the_vu1234

     %f1 = OpCopyObject %float %float_1
     %vf12 = OpCopyObject %v2float %the_vf12
     %vf123 = OpCopyObject %v3float %the_vf123
     %vf1234 = OpCopyObject %v4float %the_vf1234

     %sam = OpLoad %sampler %10
     %im = OpLoad %im_ty %20

)" +
      (is_sampled_image_type
           ? " %sampled_image = OpSampledImage %si_ty %im %sam "
           : "") +
      GetParam().spirv_image_access +
      R"(
     ; Use an anchor for the cases when the image access doesn't have a result ID.
     %1000 = OpCopyObject %uint %uint_0

     OpReturn
     OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  if (!p->BuildAndParseInternalModule()) {
    EXPECT_THAT(p->error(), StartsWith(GetParam().expected_error)) << assembly;
  } else {
    EXPECT_TRUE(p->error().empty()) << p->error();
    auto fe = p->function_emitter(100);
    // We actually have to generate the module to cache expressions for the
    // result IDs, particularly the OpCopyObject
    fe.Emit();

    const spvtools::opt::Instruction* anchor = p->GetInstructionForTest(1000);
    ASSERT_NE(anchor, nullptr);
    const spvtools::opt::Instruction& image_access = *(anchor->PreviousNode());

    ast::ExpressionList result =
        fe.MakeCoordinateOperandsForImageAccess(image_access);
    if (GetParam().expected_error.empty()) {
      EXPECT_TRUE(fe.success()) << p->error();
      EXPECT_TRUE(p->error().empty());
      std::vector<std::string> result_strings;
      Program program = p->program();
      for (auto* expr : result) {
        ASSERT_NE(expr, nullptr);
        result_strings.push_back(test::ToString(program, expr));
      }
      EXPECT_THAT(result_strings,
                  ::testing::ContainerEq(GetParam().expected_expressions));
    } else {
      EXPECT_FALSE(fe.success());
      EXPECT_THAT(p->error(), Eq(GetParam().expected_error)) << assembly;
      EXPECT_TRUE(result.empty());
    }
  }

  const bool is_sample_level =
      GetParam().spirv_image_access.find("ImageSampleExplicitLod") !=
      std::string::npos;
  const bool is_comparison_sample_level =
      GetParam().spirv_image_access.find("ImageSampleDrefExplicitLod") !=
      std::string::npos;
  const bool is_1d =
      GetParam().spirv_image_type_details.find("1D") != std::string::npos;
  if (is_sample_level && is_1d) {
    p->SkipDumpingPending("crbug.com/tint/789");
  }
  if (is_comparison_sample_level) {
    p->SkipDumpingPending("crbug.com/tint/425");
  }
}

INSTANTIATE_TEST_SUITE_P(Good_1D,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float 1D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %f1",
                              "",
                              {"f1"}},
                             {"%float 1D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf12",  // one excess arg
                              "",
                              {"vf12.x"}},
                             {"%float 1D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf123",  // two excess args
                              "",
                              {"vf123.x"}},
                             {"%float 1D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf1234",  // three excess args
                              "",
                              {"vf1234.x"}}}));

INSTANTIATE_TEST_SUITE_P(Good_1DArray,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float 1D 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf12",
                              "",
                              {"vf12.x", "i32(round(vf12.y))"}},
                             {"%float 1D 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf123",  // one excess arg
                              "",
                              {"vf123.x", "i32(round(vf123.y))"}},
                             {"%float 1D 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf1234",  // two excess args
                              "",
                              {"vf1234.x", "i32(round(vf1234.y))"}}}));

INSTANTIATE_TEST_SUITE_P(Good_2D,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float 2D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf12",
                              "",
                              {"vf12"}},
                             {"%float 2D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf123",  // one excess arg
                              "",
                              {"vf123.xy"}},
                             {"%float 2D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf1234",  // two excess args
                              "",
                              {"vf1234.xy"}}}));

INSTANTIATE_TEST_SUITE_P(Good_2DArray,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float 2D 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf123",
                              "",
                              {"vf123.xy", "i32(round(vf123.z))"}},
                             {"%float 2D 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod %v4float "
                              "%sampled_image %vf1234",  // one excess arg
                              "",
                              {"vf1234.xy", "i32(round(vf1234.z))"}}}));

INSTANTIATE_TEST_SUITE_P(Good_3D,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float 3D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod "
                              "%v4float "
                              "%sampled_image %vf123",
                              "",
                              {"vf123"}},
                             {"%float 3D 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod "
                              "%v4float "
                              "%sampled_image %vf1234",  // one excess
                                                         // arg
                              "",
                              {"vf1234.xyz"}}}));

INSTANTIATE_TEST_SUITE_P(Good_Cube,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float Cube 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod "
                              "%v4float "
                              "%sampled_image %vf123",
                              "",
                              {"vf123"}},
                             {"%float Cube 0 0 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod "
                              "%v4float "
                              "%sampled_image %vf1234",  // one excess
                                                         // arg
                              "",
                              {"vf1234.xyz"}}}));

INSTANTIATE_TEST_SUITE_P(Good_CubeArray,
                         SpvParserHandleTest_ImageCoordsTest,
                         ::testing::ValuesIn(std::vector<ImageCoordsCase>{
                             {"%float Cube 0 1 0 1 Unknown",
                              "%result = OpImageSampleImplicitLod "
                              "%v4float "
                              "%sampled_image %vf1234",
                              "",
                              {"vf1234.xyz", "i32(round(vf1234.w))"}}}));

INSTANTIATE_TEST_SUITE_P(
    PreserveFloatCoords_NonArrayed,
    // In SPIR-V, sampling and dref sampling operations use floating point
    // coordinates.  Prove that we preserve floating point-ness.
    // Test across all such instructions.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // Scalar cases
        {"%float 1D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %f1",
         "",
         {"f1"}},
        {"%float 1D 0 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4float %sampled_image %f1 Lod "
         "%f1",
         "",
         {"f1"}},
        // WGSL does not support depth textures with 1D coordinates
        // Vector cases
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %vf12",
         "",
         {"vf12"}},
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4float %sampled_image %vf12 Lod "
         "%f1",
         "",
         {"vf12"}},
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %float %sampled_image %vf12 "
         "%depth",
         "",
         {"vf12"}},
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf12 "
         "%depth Lod %float_0",
         "",
         {"vf12"}},
    }));

INSTANTIATE_TEST_SUITE_P(
    PreserveFloatCoords_Arrayed,
    // In SPIR-V, sampling and dref sampling operations use floating point
    // coordinates.  Prove that we preserve floating point-ness of the
    // coordinate part, but convert the array index to signed integer. Test
    // across all such instructions.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 1 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %vf123",
         "",
         {"vf123.xy", "i32(round(vf123.z))"}},

        {"%float 2D 0 1 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4float %sampled_image %vf123 "
         "Lod %f1",
         "",
         {"vf123.xy", "i32(round(vf123.z))"}},
        {"%float 2D 1 1 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %float %sampled_image "
         "%vf123 %depth",
         "",
         {"vf123.xy", "i32(round(vf123.z))"}},
        {"%float 2D 1 1 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image "
         "%vf123 %depth Lod %float_0",
         "",
         {"vf123.xy", "i32(round(vf123.z))"}}}));

INSTANTIATE_TEST_SUITE_P(
    PreserveIntCoords_NonArrayed,
    // In SPIR-V, image read, fetch, and write use integer coordinates.
    // Prove that we preserve signed integer coordinates.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // Scalar cases
        {"%float 1D 0 0 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %i1",
         "",
         {"i1"}},
        {"%float 1D 0 0 0 2 R32f",
         "%result = OpImageRead %v4float %im %i1",
         "",
         {"i1"}},
        {"%float 1D 0 0 0 2 R32f", "OpImageWrite %im %i1 %vf1234", "", {"i1"}},
        // Vector cases
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %vi12",
         "",
         {"vi12"}},
        {"%float 2D 0 0 0 2 R32f",
         "%result = OpImageRead %v4float %im %vi12",
         "",
         {"vi12"}},
        {"%float 2D 0 0 0 2 R32f",
         "OpImageWrite %im %vi12 %vf1234",
         "",
         {"vi12"}}}));

INSTANTIATE_TEST_SUITE_P(
    PreserveIntCoords_Arrayed,
    // In SPIR-V, image read, fetch, and write use integer coordinates.
    // Prove that we preserve signed integer coordinates.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 1 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %vi123",
         "",
         {"vi123.xy", "vi123.z"}},
        {"%float 2D 0 1 0 2 R32f",
         "%result = OpImageRead %v4float %im %vi123",
         "",
         {"vi123.xy", "vi123.z"}},
        {"%float 2D 0 1 0 2 R32f",
         "OpImageWrite %im %vi123 %vf1234",
         "",
         {"vi123.xy", "vi123.z"}}}));

INSTANTIATE_TEST_SUITE_P(
    ConvertUintCoords_NonArrayed,
    // In SPIR-V, image read, fetch, and write use integer coordinates.
    // Prove that we convert unsigned integer coordinates to signed.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // Scalar cases
        {"%float 1D 0 0 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %u1",
         "",
         {"i32(u1)"}},
        {"%float 1D 0 0 0 2 R32f",
         "%result = OpImageRead %v4float %im %u1",
         "",
         {"i32(u1)"}},
        {"%float 1D 0 0 0 2 R32f",
         "OpImageWrite %im %u1 %vf1234",
         "",
         {"i32(u1)"}},
        // Vector cases
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %vu12",
         "",
         {"vec2<i32>(vu12)"}},
        {"%float 2D 0 0 0 2 R32f",
         "%result = OpImageRead %v4float %im %vu12",
         "",
         {"vec2<i32>(vu12)"}},
        {"%float 2D 0 0 0 2 R32f",
         "OpImageWrite %im %vu12 %vf1234",
         "",
         {"vec2<i32>(vu12)"}}}));

INSTANTIATE_TEST_SUITE_P(
    ConvertUintCoords_Arrayed,
    // In SPIR-V, image read, fetch, and write use integer coordinates.
    // Prove that we convert unsigned integer coordinates to signed.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 1 0 1 Unknown",
         "%result = OpImageFetch %v4float %im %vu123",
         "",
         {"vec2<i32>(vu123.xy)", "i32(vu123.z)"}},
        {"%float 2D 0 1 0 2 R32f",
         "%result = OpImageRead %v4float %im %vu123",
         "",
         {"vec2<i32>(vu123.xy)", "i32(vu123.z)"}},
        {"%float 2D 0 1 0 2 R32f",
         "OpImageWrite %im %vu123 %vf1234",
         "",
         {"vec2<i32>(vu123.xy)", "i32(vu123.z)"}}}));

INSTANTIATE_TEST_SUITE_P(
    BadInstructions,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 1D 0 0 0 1 Unknown",
         "OpNop",
         "not an image access instruction: OpNop",
         {}},
        {"%float 1D 0 0 0 1 Unknown",
         "%50 = OpCopyObject %float %float_1",
         "internal error: couldn't find image for "
         "%50 = OpCopyObject %18 %45",
         {}},
        {"%float 1D 0 0 0 1 Unknown",
         "OpStore %float_var %float_1",
         "invalid type for image or sampler "
         "variable or function parameter: %1 = OpVariable %2 Function",
         {}},
        // An example with a missing coordinate
        // won't assemble, so we skip it.
    }));

INSTANTIATE_TEST_SUITE_P(
    Bad_Coordinate,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 1D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod "
         // bad type for coordinate: not a number
         "%v4float %sampled_image %float_var",
         "bad or unsupported coordinate type for image access: %73 = "
         "OpImageSampleImplicitLod %42 %72 %1",
         {}},
        {"%float 2D 0 0 0 1 Unknown",  // 2D
         "%result = OpImageSampleImplicitLod "
         // 1 component, but need 2
         "%v4float %sampled_image %f1",
         "image access required 2 coordinate components, but only 1 provided, "
         "in: %73 = OpImageSampleImplicitLod %42 %72 %12",
         {}},
        {"%float 2D 0 1 0 1 Unknown",  // 2DArray
         "%result = OpImageSampleImplicitLod "
         // 2 component, but need 3
         "%v4float %sampled_image %vf12",
         "image access required 3 coordinate components, but only 2 provided, "
         "in: %73 = OpImageSampleImplicitLod %42 %72 %13",
         {}},
        {"%float 3D 0 0 0 1 Unknown",  // 3D
         "%result = OpImageSampleImplicitLod "
         // 2 components, but need 3
         "%v4float %sampled_image %vf12",
         "image access required 3 coordinate components, but only 2 provided, "
         "in: %73 = OpImageSampleImplicitLod %42 %72 %13",
         {}},
    }));

INSTANTIATE_TEST_SUITE_P(
    SampleNonFloatTexture_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // ImageSampleImplicitLod
        {"%uint 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4uint %sampled_image %vf12",
         "sampled image must have float component type",
         {}},
        {"%int 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4int %sampled_image %vf12",
         "sampled image must have float component type",
         {}},
        // ImageSampleExplicitLod
        {"%uint 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4uint %sampled_image %vf12 "
         "Lod %f1",
         "sampled image must have float component type",
         {}},
        {"%int 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleExplicitLod %v4int %sampled_image %vf12 "
         "Lod %f1",
         "sampled image must have float component type",
         {}},
        // ImageSampleDrefImplicitLod
        {"%uint 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %uint %sampled_image %vf12 "
         "%f1",
         "sampled image must have float component type",
         {}},
        {"%int 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %int %sampled_image %vf12 "
         "%f1",
         "sampled image must have float component type",
         {}},
        // ImageSampleDrefExplicitLod
        {"%uint 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %uint %sampled_image %vf12 "
         "%f1 Lod %float_0",
         "sampled image must have float component type",
         {}},
        {"%int 2D 0 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %int %sampled_image %vf12 "
         "%f1 Lod %float_0",
         "sampled image must have float component type",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ConstOffset_BadInstruction_Errors,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // ImageFetch
        {"%uint 2D 0 0 0 1 Unknown",
         "%result = OpImageFetch %v4uint %sampled_image %vf12 ConstOffset "
         "%the_vu12",
         "ConstOffset is only permitted for sampling, gather, or "
         "depth-reference gather operations: ",
         {}},
        // ImageRead
        {"%uint 2D 0 0 0 2 Rgba32ui",
         "%result = OpImageRead %v4uint %im %vu12 ConstOffset %the_vu12",
         "ConstOffset is only permitted for sampling, gather, or "
         "depth-reference gather operations: ",
         {}},
        // ImageWrite
        {"%uint 2D 0 0 0 2 Rgba32ui",
         "OpImageWrite %im %vu12 %vu1234 ConstOffset %the_vu12",
         "ConstOffset is only permitted for sampling, gather, or "
         "depth-reference gather operations: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ConstOffset_BadDim_Errors,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // 1D
        {"%uint 1D 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %vf1234 "
         "ConstOffset %the_vu12",
         "ConstOffset is only permitted for 2D, 2D Arrayed, and 3D textures: ",
         {}},
        // Cube
        {"%uint Cube 0 0 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %vf1234 "
         "ConstOffset %the_vu12",
         "ConstOffset is only permitted for 2D, 2D Arrayed, and 3D textures: ",
         {}},
        // Cube Array
        {"%uint Cube 0 1 0 1 Unknown",
         "%result = OpImageSampleImplicitLod %v4float %sampled_image %vf1234 "
         "ConstOffset %the_vu12",
         "ConstOffset is only permitted for 2D, 2D Arrayed, and 3D textures: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleDref_Bias_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // Implicit Lod
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %float %sampled_image %vf1234 "
         "%depth Bias %float_null",
         "WGSL does not support depth-reference sampling with level-of-detail "
         "bias: ",
         {}},
        // Explicit Lod
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf1234 "
         "%depth Lod|Bias %float_null %float_null",
         "WGSL does not support depth-reference sampling with level-of-detail "
         "bias: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleDref_Grad_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // Implicit Lod
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefImplicitLod %float %sampled_image %vf1234 "
         "%depth Grad %float_1 %float_2",
         "WGSL does not support depth-reference sampling with explicit "
         "gradient: ",
         {}},
        // Explicit Lod
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf1234 "
         "%depth Lod|Grad %float_null %float_1  %float_2",
         "WGSL does not support depth-reference sampling with explicit "
         "gradient: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleDrefExplicitLod_CheckForLod0,
    // Metal requires comparison sampling with explicit Level-of-detail to use
    // Lod 0.  The SPIR-V reader requires the operand to be parsed as a constant
    // 0 value. SPIR-V validation requires the Lod parameter to be a floating
    // point value for non-fetch operations. So only test float values.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // float 0.0 works
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf1234 "
         "%depth Lod %float_0",
         "",
         {"vf1234.xy"}},
        // float null works
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf1234 "
         "%depth Lod %float_0",
         "",
         {"vf1234.xy"}},
        // float 1.0 fails.
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleDrefExplicitLod %float %sampled_image %vf1234 "
         "%depth Lod %float_1",
         "WGSL comparison sampling without derivatives requires "
         "level-of-detail "
         "0.0",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageSampleProjDrefExplicitLod_CheckForLod0,
    // This is like the previous test, but for Projection sampling.
    //
    // Metal requires comparison sampling with explicit Level-of-detail to use
    // Lod 0.  The SPIR-V reader requires the operand to be parsed as a constant
    // 0 value. SPIR-V validation requires the Lod parameter to be a floating
    // point value for non-fetch operations. So only test float values.
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        // float 0.0 works
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleProjDrefExplicitLod %float %sampled_image "
         "%vf1234 %depth Lod %float_0",
         "",
         {"(vf1234.xy / vf1234.z)"}},
        // float null works
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleProjDrefExplicitLod %float %sampled_image "
         "%vf1234 %depth Lod %float_0",
         "",
         {"(vf1234.xy / vf1234.z)"}},
        // float 1.0 fails.
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageSampleProjDrefExplicitLod %float %sampled_image "
         "%vf1234 %depth Lod %float_1",
         "WGSL comparison sampling without derivatives requires "
         "level-of-detail "
         "0.0",
         {}}}));

TEST_F(SpvParserHandleTest, CombinedImageSampler_IsError) {
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %100 "main"
     OpExecutionMode %100 OriginUpperLeft

     OpDecorate %var DescriptorSet 0
     OpDecorate %var Binding 0
  %float = OpTypeFloat 32
     %im = OpTypeImage %float 2D 0 0 0 1 Unknown
     %si = OpTypeSampledImage %im
 %ptr_si = OpTypePointer UniformConstant %si
    %var = OpVariable %ptr_si UniformConstant
   %void = OpTypeVoid
 %voidfn = OpTypeFunction %void

    %100 = OpFunction %void None %voidfn
  %entry = OpLabel
           OpReturn
           OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  EXPECT_FALSE(p->BuildAndParseInternalModule()) << assembly;
  EXPECT_THAT(p->error(),
              HasSubstr("WGSL does not support combined image-samplers: "));
}

INSTANTIATE_TEST_SUITE_P(
    ImageQueryLod_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageQueryLod %v2int %sampled_image %vf12",
         "WGSL does not support querying the level of detail of an image: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageGather_Bias_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageGather %v4float %sampled_image %vf12 %int_1 "
         "Bias %float_null",
         "WGSL does not support image gather with level-of-detail bias: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageDrefGather_Bias_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageDrefGather %v4float %sampled_image %vf12 %depth "
         "Bias %float_null",
         "WGSL does not support image gather with level-of-detail bias: ",
         {}}}));

// Note: Vulkan SPIR-V ImageGather and ImageDrefGather do not allow explicit
// Lod. The SPIR-V validator should reject those cases already.

INSTANTIATE_TEST_SUITE_P(
    ImageGather_Grad_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 0 0 0 1 Unknown",
         "%result = OpImageGather %v4float %sampled_image %vf12 %int_1 "
         "Grad %vf12 %vf12",
         "WGSL does not support image gather with explicit gradient: ",
         {}}}));

INSTANTIATE_TEST_SUITE_P(
    ImageDrefGather_Grad_IsError,
    SpvParserHandleTest_ImageCoordsTest,
    ::testing::ValuesIn(std::vector<ImageCoordsCase>{
        {"%float 2D 1 0 0 1 Unknown",
         "%result = OpImageDrefGather %v4float %sampled_image %vf12 %depth "
         "Grad %vf12 %vf12",
         "WGSL does not support image gather with explicit gradient: ",
         {}}}));

TEST_F(SpvParserHandleTest,
       NeverGenerateConstDeclForHandle_UseVariableDirectly) {
  // An ad-hoc test to prove we never had the issue
  // feared in crbug.com/tint/265.
  // Never create a const-declaration for a pointer to
  // a texture or sampler. Code generation always
  // traces back to the memory object declaration.
  const auto assembly = Preamble() + R"(
     OpEntryPoint Fragment %100 "main"
     OpExecutionMode %100 OriginUpperLeft

     OpName %var "var"
     OpDecorate %var_im DescriptorSet 0
     OpDecorate %var_im Binding 0
     OpDecorate %var_s DescriptorSet 0
     OpDecorate %var_s Binding 1
  %float = OpTypeFloat 32
  %v4float = OpTypeVector %float 4
  %v2float = OpTypeVector %float 2
  %v2_0 = OpConstantNull %v2float
     %im = OpTypeImage %float 2D 0 0 0 1 Unknown
     %si = OpTypeSampledImage %im
      %s = OpTypeSampler
 %ptr_im = OpTypePointer UniformConstant %im
  %ptr_s = OpTypePointer UniformConstant %s
 %var_im = OpVariable %ptr_im UniformConstant
  %var_s = OpVariable %ptr_s UniformConstant
   %void = OpTypeVoid
 %voidfn = OpTypeFunction %void
 %ptr_v4 = OpTypePointer Function %v4float

    %100 = OpFunction %void None %voidfn
  %entry = OpLabel
    %var = OpVariable %ptr_v4 Function

; Try to induce generating a const-declaration of a pointer to
; a sampler or texture.

 %var_im_copy = OpCopyObject %ptr_im %var_im
  %var_s_copy = OpCopyObject %ptr_s %var_s

         %im0 = OpLoad %im %var_im_copy
          %s0 = OpLoad %s %var_s_copy
         %si0 = OpSampledImage %si %im0 %s0
          %t0 = OpImageSampleImplicitLod %v4float %si0 %v2_0


         %im1 = OpLoad %im %var_im_copy
          %s1 = OpLoad %s %var_s_copy
         %si1 = OpSampledImage %si %im1 %s1
          %t1 = OpImageSampleImplicitLod %v4float %si1 %v2_0

         %sum = OpFAdd %v4float %t0 %t1
           OpStore %var %sum

           OpReturn
           OpFunctionEnd
  )";
  auto p = parser(test::Assemble(assembly));
  EXPECT_TRUE(p->BuildAndParseInternalModule()) << assembly;
  auto fe = p->function_emitter(100);
  EXPECT_TRUE(fe.EmitBody()) << p->error();
  EXPECT_TRUE(p->error().empty()) << p->error();
  auto ast_body = fe.ast_body();
  const auto got = test::ToString(p->program(), ast_body);
  auto* expect = R"(var var_1 : vec4<f32>;
let x_22 : vec4<f32> = textureSample(x_2, x_3, vec2<f32>());
let x_26 : vec4<f32> = textureSample(x_2, x_3, vec2<f32>());
var_1 = (x_22 + x_26);
return;
)";
  ASSERT_EQ(expect, got);
}

}  // namespace
}  // namespace spirv
}  // namespace reader
}  // namespace tint
